In order to solve the problem that the short-range fire support is not strong and the precision is not high in the landing operation, an unmanned boat integrated with the shore is designed. The design of the catamaran structure is adopted, and the overall design of the unmanned boat is designed by Soildworks simulation software. Through the fire control solution, the method of observing ballistic calibration is used to predict the impact point of the opposite shore. Using the observation bias method, the influence of unmanned boat’s spring measurement and ballistic meteorological velocity on the accuracy of shooting were calculated and verified by simulation experiments. The simulation results show that the unmanned boat can perform tactical research for the landing troops by performing tasks such as autonomous navigation patrol, onshore fire support, and precision strike targets.