In order to solve the problems of complex electric propulsion system, harmonic interference, large equipment space occupation and high system cost of a deep sea aquaculture platform, a design method of variable frequency soft start electric propulsion pitch control propeller power system is adopted in combination with the requirements of the power system for fishing. After comparing the configuration scheme of the system, studying the characteristic curves of the propulsion motor and propeller during the startup and operation of the system, and comparing and analyzing the cost and performance of the controllable pitch propeller power system, it is concluded that the electric propulsion controllable pitch propeller power system can simplify the power distribution network of the power system, reduce the cost of the power distribution device, improve the system redundancy, and reduce the harmonic of the power grid. The research shows that the scheme is economical, feasible, reliable and suitable for fishing.