In order to improve the accuracy of feeding boats in shrimp and crab ponds, reduce energy consumption, and increase stability and reliability, a design and hydrodynamic simulation experiment is proposed for the three-blade propeller of feeding boats in shrimp and crab ponds. According to the hull size and the upper limit of overall power consumption, the propeller diameters of the three suitable shrimp and crab pond feeding boats were set to be 0.05, 0.06 and 0.07 m, respectively, and the theoretical equation of the ship's propeller jet and the coordinate equation of the blade edge point are as follows:Basically, a three-dimensional blade curve is generated from the three-dimensional coordinates of the blade edge to establish a three-dimensional model of the propeller. Using Ansys CFD software, the Reynolds average Navier-Stokes (RANS) equation and the SST k-ω turbulence model were used to construct a hydrodynamic simulation experiment, and the error between the maximum axial jet velocity and the average axial jet velocity of the propeller was analyzed. The relationship between blade section pressure, rotation speed and average axial jet velocity was analysed to obtain the propeller with the best open water performance. Through the shrimp and crab pond field experiments, the error between the actual ship speed and the maximum axial jet velocity was analyzed to verify the reliability of the propeller design. At the same time, it met the requirements of the shrimp and crab pond feeding boat speed, hull thrust and overall power consumption. Taking the working efficiency of the propeller as the experimental index, the actual working efficiency of the propellers of different diameters at different speeds was compared. The results show that the design method for the propeller of the shrimp and crab pond feeding boat is feasible. The error between the actual ship speed and the maximum axial jet velocity is less than 10%. At the same time, the shrimp and crab pond feeding boat is equipped with a 0.07 m diameter propeller. When the rotating speed is 3 500 r/min, the working energy consumption of the propeller is 135 W, the highest average ship speed is 1.46 m/s, and the working efficiency reaches 70.9%.