In this paper, we use Maxwell 16 to simulate the induction coil gun, Based on the analysis of the trigger position and the outer diameter of the aluminum projectile, the reasonable simulation parameters are set up, and the simulation results of the three stage coil gun firing are obtained. On the basis of the simulation results, the main circuit, the switch control circuit and the photoelectric speed measuring circuit are designed to form the experimental platform of electromagnetic coil gun by using FPGA as the controller. Through many experiments and analysis, the experimental results are consistent with the simulation, which verifies the feasibility of the experimental platform and the rationality of the simulation.