According to problem of environmental disturbance and internal parameter uncertainty of controlled object in servo control system of tank gun, a set of tank gun control system test platform is researched. The working principle and system structure of the testing platform are described. Three closed-loops control system, which includes the current loop, speed loop and position loop, is designed with fire control computer and data acquisition card and the parameters are set in real time by neural network PID control algorithm. LABVIEW software is used to realize the data acquisition, communication and neural network PID control of the host computer. The test platform is tested at last. The experimental results show that the test platform can meet the requirements of the tank gun servo control system and the system has strong adaptability and .