The invention discloses an active harmonic wave generator. A DSP control circuit comprises a DSP digital signal processor, an FPGA programmable logic device, an external ADC transverter and a phase-lock loop circuit, three-phase voltage signals turn into square signals through a signal conditioning circuit and pass through the phase-lock loop circuit composed by phase-lock chips CD4046 for phase locking, a voltage-controlled oscillator of the phase-lock loop circuit outputs a signal CINA and sends the signal to an FPGA chip, prescale is carried out on the signal CINA by a prescale circuit in the FPGA chip, the obtained pulse signal after the prescale can exactly achieve 1024 square-wave pulses in a fundamental period, and the pulse signal is divided into three paths. The generator can satisfy practical production requirements of harmonic current and provide required conditions of a test for electrical equipment.