A power-inlet plug has an installation seat, an elastic electrical conductive member and an external connector, the elastic electrical conductive member having a fixing portion and an elastic portion electrically connected to the fixing portion, the installation seat is provided with an installation cavity that accommodates the fixing portion and the external connector and a locking mechanism for detachable fix of the installation seat, the installation cavity is provided with an hole providing for the elastic portion extending out, and the elastic portion is provided with a retractable electrical contact. By setting the stop block, the permanent deformation and collapse of the shrapnel can be effectively prevented, and the problems of poor contact and contact failure can be solved. The locking part drives down the locking tongue and the power supply track extrusion locking structure design, effectively prevents the power-inlet plug from falling off.