Self-locking device

The invention relates to the technical field of brake devices and discloses a self-locking device. The device comprises a manual control switch, a transmission mechanism and a spacing mechanism; the manual control switch is arranged on a baby carriage handle and the spacing mechanism is arranged beside a baby carriage wheel and connected with the manual control switch through the transmission mechanism; the manual control switch comprises two control positions: a locking position and an unlocking position; under normal state, the manual control switch is in the locking position. By means of the self-locking device of a baby carriage provided by the invention, in the absence of guardians pushing and encountering wet and slippery road conditions or other adverse factors, wheels of the baby carriage can automatically locked; when parents push the baby carriage, the wheels will unlocked so as to avoid dangers caused by careless parents who neglectfully forget to lock the baby carriage; theentire device does not n