A receptacle electrical connector has an insulated housing, a first terminal set, a second terminal set, a shielding plate and a metallic shell. The shielding plate has two connection portions formed respectively on two opposite sides of the shielding plate and each connection portion has a cutting surface. The cutting surface is formed on the connection portion, and the two cutting surfaces of the connection portions are exposed out of two opposite sides of the insulated housing. During the insert-molding processes of insulated housings, the connection beltings of metallic beltings are connected to the cutting surfaces of multiple shielding plates for simultaneously forming multiple insulated housings. Therefore, production efficiency and yield rate of the receptacle electrical connectors are enhanced.