The invention discloses an arbitrary-waveform heavy current generator based on power amplifiers in parallel. The arbitrary-waveform heavy current generator comprises a current signal outputting device, a power amplifier container, a high power direct-current power supply and a monitoring terminal which is used for outputting voltage and current of the power amplifier container. The current signal outputting device is connected with the monitoring terminal through the power amplifier container. The high power direct-current power supply is connected with the power supply input port of the power amplifier container. A two-stage amplifier circuit is arranged inside the power amplifier container, and the high power direct-current power supply is connected with the power supply input port of the power amplifier container. By means of the power amplifiers in parallel, the arbitrary-waveform heavy current generator can output alternating-current and direct-current composite heavy current for inspecting a current transformer and other electrical equipment working on the condition of direct-current magnetic biasing, and can also reproduce current waveform in fault of a power grid to further provide conditions for performing more specific and detailed research of operating characteristics of the current transformer and the other electrical equipment, and accordingly has good application prospect.