A 3-channel electromagnetic signal acquisition platform based on FPGA is designed by utilizing the rich on-chip resources and powerful parallel processing capability of FPGA. At the same time, the three signals can be pre-amplified, signal conditioning, analog-to-digital conversion and stored in the memory, and then processed by the upper computer. At room temperature, two sets of standard sinusoidal signals with frequency of 2ⁿ Hz(-2≤n≤13), and amplitude of 1 V are collected, after correction, the relative error between the actual measurement amplitude and the theoretical value of the acquisition platform is less than 0.1%, and the root mean square error of the channel is less than 0.024%. This platform has high acquisition accuracy and great potential for function expansion.