The invention relates to a device and method for testing a reverse recovery phase protection unit of a light control converter valve. On the basis of the existing testing device for detecting a RPU board, a current detection device for detecting the magnitude of the current of a power supply input terminal of the RPU board is added, a pulse generation circuit for generating the required voltage pulse is improved, the test procedure and method of the RPU board are clarified, and thus the functional verification and fault location of an enable signal input module, a working power supply module,a current sampling module, a pulse extension module and a checkback signal output module of the RPU board can be completed quickly and efficiently.