A photovoltaic system safety protection device comprises N photovoltaic modules serially connected in series, an inverter connected with the first photovoltaic module and the Nth photovoltaic module;each photovoltaic module comprises a photovoltaic module, a cable shutter connected with the first output terminal of the photovoltaic module through the first connector; The second output of the photovoltaic module in the Mth photovoltaic module is connected to the second connector of the cable breaker in the M-1 photovoltaic module, and the second connector of the cable breaker in the Mth photovoltaic module is a second output end of the photovoltaic module of the M+1th photovoltaic module is connected; a cable shutter is configured to cancel an output voltage between the first output end and the second output end of the photovoltaic component after the RSD is activated, so as to The voltage on the DC bus connected to the inverter is equal to zero. The above technical solutions disclosedin the present application can improve the stability and stability of control, simplify circuit connection, and reduce cost.