A connector, at least comprising: a socket, comprising a connection end, wherein a slot, which extends along a length direction of the socket from an end surface of the connection end, is provided on the socket; a bolt, comprising a bolt main body that is adapted to the slot, wherein a front end of the bolt main body is provided with at least two expansion arms, and the bolt main body is internally provided with an expansion channel which traverses the bolt main body along a length direction; and an expansion bolt, the expansion bolt comprising an expansion bolt main body that matches the expansion channel, wherein a front end of the expansion bolt main body is provided with an acting end that interacts with the expansion arms, and the socket and the bolt are tightly connected by means of an expansion force that is generated by the acting end opening the expansion arms; each expansion arm is provided with clamping teeth on surfaces corresponding to the inner walls of the slot, the side walls of the slot are provided with limiting teeth corresponding to the clamping teeth, and the clamping teeth are meshed with the limiting teeth in a connected state, characterized in that an end part of the acting end is provided with a first limiting block, and a side surface of the first limiting block away from the acting end is provided with a chamfer, wherein the connector is configured so that, after the installation is completed, the first limiting block passes through the expansion channel and abuts against the expansion arm, so as to prevent the expansion bolt from retreating from the expansion channel to improve the reliability of connection. a socket, comprising a connection end, wherein a slot, which extends along a length direction of the socket from an end surface of the connection end, is provided on the socket; a bolt, comprising a bolt main body that is adapted to the slot, wherein a front end of the bolt main body is provided with at least two expansion arms, and the bolt main body is internally provided with an expansion channel which traverses the bolt main body along a length direction; and an expansion bolt, the expansion bolt comprising an expansion bolt main body that matches the expansion channel, wherein a front end of the expansion bolt main body is provided with an acting end that interacts with the expansion arms, and the socket and the bolt are tightly connected by means of an expansion force that is generated by the acting end opening the expansion arms; each expansion arm is provided with clamping teeth on surfaces corresponding to the inner walls of the slot, the side walls of the slot are provided with limiting teeth corresponding to the clamping teeth, and the clamping teeth are meshed with the limiting teeth in a connected state, characterized in that an end part of the acting end is provided with a first limiting block, and a side surface of the first limiting block away from the acting end is provided with a chamfer, wherein the connector is configured so that, after the installation is completed, the first limiting block passes through the expansion channel and abuts against the expansion arm, so as to prevent the expansion bolt from retreating from the expansion channel to improve the reliability of connection.