A quick connect plug for cables includes a connecting portion configured to connect a cable and a plug pin configured to form a plug-in connection with a socket. The plug pin is fixedly provided with a plug-in unit. A portion of the plug-in unit protruding out of an external annular surface of the plug pin forms a locking head matched with a socket slot. A gap is provided between a portion of the plug-in unit near the locking head and the plug pin, so as to enable the locking head to move along an axis direction of the plug pin, and the gap can limit the maximum displacement of the locking head. By providing a plug-in unit and a gap between the portion of the plug-in unit near the locking head and the plug pin, the plug-in unit is enabled to move, thus having certain elasticity.