The invention discloses an internal plug-in of a power strip socket. The internal plug-in comprises a plug-in complex, wherein the plug-in complex is composed of a copper conductor and a leaf spring which coats the copper conductor, wherein the leaf spring comprises plug-in pins, a plug-in base and flat-hole conductive pins; the copper conductor comprises a component which is of the same structureof the leaf spring; meanwhile, an outer contour area of the copper conductor matches an inner contour area of the leaf spring, and the copper conductor is embedded in the leaf spring to form the plug-in complex. Compared with the problems such as loosened contact points of a plug and a plug-in, reduced current passing property and low electrical conductivity in the prior art, the internal plug-inof the power strip socket can increase the contact area of the plug-in complex and the plug freely without causing reduction of elasticity of the copper conductor, thus the electrical conductivity between the plug and the plug-in complex is increased, the electric conduction quantity is increased, and looseness cannot be caused by repeated plugging and unplugging.