a lock main body, provided with an accommodating cavity, an opening located at an end of the accommodating cavity, and a first through hole located at a side of the accommodating cavity, the opening and the first through hole both being in communication with the accommodating cavity, the first through hole is configured for insertion of a product with a hole;

an elastic member, one end of the elastic member being fixed on the bottom of the accommodating cavity opposite the opening; and

a clamping button, comprising a button main body provided with a groove and a clamping boss obtained by extending from the button main body towards the groove, wherein the button main body is inserted into the accommodating cavity from the opening, the button main body is movable relative to the lock main body, the button main body abuts against the other end of the elastic member, and the clamping boss corresponds to the first through hole and is configured to be inserted into the hole of the product to realize locking.