A receptacle electrical connector has an insulative mounting bracket, a first terminal set, a second terminal set, a shielding plate and a shell. The shield plate has two connection portions formed respectively on two opposite sides of the shielding plate and each connection portion 53 has a strip cross section. The strip cross section is formed on the connection portion, and the two strip cross sections of the connection portions are exposed out of two opposite sides of the insulative mounting bracket. During the insert-molding processes of insulative mounting brackets, connecting arms of strips are connected to the strip cross sections of multiple shielding plates for simultaneously forming multiple insulative mounting brackets. Therefore, production efficiency and production rate of the receptacle electrical connectors are enhanced.