A reinforcing structure of an electrical receptacle connector includes an insulation housing, a terminal group, and a reinforcing sheet. The insulation housing includes a substrate and a tongue portion extending to one side of the substrate. The tongue portion includes a top surface, a bottom surface, and a front side surface between the top surface and the bottom surface. The terminal group is provided on the bottom surface, and includes a power supply terminal and a grounding terminal. A contact wall is formed between the power supply terminal and the front side surface, and the reinforcing sheet is provided on the top surface. The reinforcing sheet includes a front baffle and a recessed portion, the front baffle is fixed on the front side surface, and the recessed portion inwardly curves to be formed on the front baffle and corresponds to the contact wall.