The invention relates to an inverter protection circuit and a servo device. The protection circuit comprises a power supply control circuit, a buffer control circuit, a power supply switch assembly and a current buffer assembly. The power supply switch assembly and the current buffer assembly are arranged in a bus bar connected with the inverter. The power supply control circuit is connected withthe power supply switch assembly and is also used for connecting a main control chip. The buffer control circuit is connected with a power supply control circuit and a current buffer assembly. After receiving the conductive communication signal sent by the master control chip, the bus is controlled to access the direct current and sent to the inverter and the access direct current is limited, after the master chip executes the system initialization command first to ensure that the power switching device of the inverter is in a safe and controlled state, Then the power-on control command of thebus bar is executed to avoid the situation that the voltage of the bus bar is established before the driving circuit of the upper and lower leg of each phase of the inverter gives a definite drivingsignal, and the current on the initial bus bar is limited and buffered to improve the power supply safety of the inverter.