Black-start grid-connected switch non-voltage switching-on device and method

The invention discloses a black-start grid-connected switch non-voltage switching-on device which comprises a power supply, a switching-on switch, a relay module and a switching-on signal output module, According to the black-start grid-connected switch non-voltage switching-on device, an operating state of a relay in a relay module is controlled through a switching-on switch, then the relay is switched between a normally-open contact state and a normally-closed contact state, a normally-open contact is connected with a switching-on signal output module, and the switching-on signal output module is connected with a grid-connected switch switching-on input signal channel of a synchronization device; when the relay operates, the normally-open contact is closed, i.e., a grid-connected switchof the synchronization device is switched on to input signal for conduction, a non-voltage switching-on function of the grid-connected switch is realized, and after the grid-connected switch is closed, the switching-on switch