Protection circuit of photovoltaic inverter

The invention provides a protection circuit of a photovoltaic inverter. The photovoltaic inverter comprises input terminals, output terminals and an internal circuit, and the input terminals and the output terminals are electrically connected with the internal circuit. The protection circuit comprises a safety protection switching device. The input terminals and the internal circuit are electrically connected through the safety protection switching device. The safety protection switching device comprises a plurality of protection switches connected in parallel, and each input terminal corresponds to one protection switch. The protection circuit of the photovoltaic inverter is simple in structure and easy to implement, and can prevent safety accidents like electric shock and improve the safety of the photovoltaic inverter.