Lock capable of replacing hidden blade and key for lock

The invention discloses a lock capable of replacing a hidden blade and a key for the lock. The lock comprises the key, a lock body shell, a bottom plate, a lock cylinder and a lock deflector rod. Thelock deflector rod is arranged in the lock body shell and is fixed through a buckle cover of the bottom plate; the key is inserted into the lock cylinder and deflects the lock deflector rod to controla spring bolt in the lock body shell to stretch out and retract; the lock deflector rod comprises a lock body, a blade sleeve, multiple blades, multiple spacers, a side deflector block and a cover plate; the multiple blades and the multiple spacers are overlaid and matched so as to be loaded into the blade sleeve; the part of the lock cylinder is inserted into the blade sleeve and is matched withthe sleeved blade on the periphery; the assembled lock cylinder and blade sleeve are arranged in the lock body so as to be sealed and fixed to a side face end of the bottom plate through the cover plate in a parallel and level