A wire plug-in aid sleeve structure for wire connection terminal is assembled in a wire plug-in hole of the terminal. The aid sleeve includes a head section, a belly section connected with the head section and a tail section connected with the belly section. The head section, the belly section and the tail section together define a guide hole for the conductive wire to plug in. The tail section has a first side and a second side positioned on a peripheral section of the guide hole. After the conductive wire passes through the guide hole into the terminal, the metal leaf spring disposed in the terminal is facilitated to press the conductive wire toward the first side or second side.