The invention relates to a multi-CPU framework based APF control board, and belongs to the technical field of active filter design. The APF control board adopts at least four CPUs, wherein three CPUs are used for detecting and controlling carrier currents of loads of a phase A, a phase B and a phase C respectively; and one CPU is used for finishing logic control of I/O and PWM control of conversion from two levels to three levels. According to the APF control board, the plurality of CPUs are adopted for concurrent working, the three CPUs are used for independently realizing A phase control, B phase control and C phase control respectively without mutual interference, so that the running efficiency of the APF board is effectively improved; and the APF control board is flexible in communication, reliable in protection, flexible in platform structure development, easy in capacity expansion and transplantation and simple in engineering realization, lays a foundation for quickness and stability of APF control, can well meet demands of APF control, and has very important theoretical significance and engineering practical significance.