The present invention provides a piercing-through structure for a connector, comprising a hollow-core body, a lead, and a receptacle. Wherein a front connection portion is disposed at a front end of the hollow-core body; a plurality of wires extending forward is disposed at a front end of the lead disposed at a rear segment in the hollow-core body; and a plurality of metallic spikes is disposed at a front end of the connector of the receptacle and a connection sleeve movably fits around a front end of the body. So that connecting the hollow-core body and the receptacle together enables the connection sleeve of the receptacle to fit around the front connection portion of the hollow-core body, allowing the metallic spikes to pierce across surfaces of the wires such that, after piercing insulating sheaths of the wires, the metallic spikes come into contact with metallic cores of the wires, so as to achieve electrical connection of the connector of the receptacle and the wires of the hollow-core body.