Aiming to solve the problem of poor weeding effect and high energy consumption of the paddy between plant weeding device, an inverted V- type counter-rotating weeding device between plant in paddy field was designed. Through theoretical analysis, the main structural parameters of the weeding device were determined. Using MATLAB virtual simulation combined with indoor test, the theoretical rotation trajectory of the weeding claw and the actual soil cutting trajectory model was established, and the factors affecting the weeding performance were determined. The machine forward speed, the rotary velocity of weeding claw and the thickness of the water layer were selected as the test factors, and the stress and the weeding rate were used as the test indicators to perform a rotating orthogonal test. Using variance analysis and response surface analysis methods, the influence of each factor and its first-level interaction on the test indicators were obtained. The multi- objective optimization design method was adopted in order to obtain the best combination of factors and parameters of the inverted V-type contra-rotating weeding device, and the optimization results was verified through indoor test, and finally the field performance of the device was verified through field test. The results showed that the interaction of the machine forward speed and the thickness of water layer, the rotary velocity of weeding claw and the thickness of water layer has an obvious influence on the stress. The order of the influence of each factor on the stress is: thickness of water layer> machine forward speed> rotary velocity of weeding claw. The interaction between the machine forward speed and the rotary velocity of weeding claw, the rotary velocity of weeding claw and the thickness of water layer has an obvious influence on the weeding rate. The order of the influence of each factor on the weeding rate is: rotary velocity of weeding claw> thickness of water layer> machine forward speed. Indoor test verification showed that: under the best combination of parameters with a machine forward speed of 0.76 m/s, a rotary velocity of weeding claw of 112.00 r/min, and a thickness of water layer of 0.01 m, the average stress was 0.54174MPa, and the error between the optimization results was 0.42 % the average weeding rate was 82.344%, and the error between the optimized results was 0.80% at the same time, the seedling damage rate in the indoor test was 4.16% the field test equipment runs smoothly, and the power consumption and weeding performance meet the agronomic requirements of the paddy field weeding machine.