The utility model discloses a modular parallel-processing active power filter control system comprising a display, a master control board, a first slave control board, a second slave control board, a third slave control board, a voltage sensor, and a current sensor. The master control board is connected with the display, the voltage sensor, the current sensor, the first slave control board, the second slave control board, and the third slave control board. Since industrial fields are all provided with three-phase loads, the modular parallel-processing active power filter control system, by means of a high-speed parallel processing capability of a FPGA, achieves three-phase modular control, performs parallel detection and processing on three-phase harmonic wave current, shortens a computing period, increases the number of harmonic detection within certain time, improves detection precision, and satisfies the requirements of various loads.