This invention discloses a micro-switch locking the sub-switch automatically including a shell with a sub-switch, which is matched with a position for finishing circuit conversion of the connection relation of the micro-switch when it is pressed for the first time and a locking unit finishing reset when being pressed for the second time, said sub-switch of which can be located at the position forfinishing the conversion of the circuit relation conversion of the micro-switch when being pressed firstly and finishing reset when being pressed secondly.