An electric connection socket (300), an optical module (600), and an optical module cage (500). The electric connection socket comprises: an insulating base, the base comprising an upper surface (311), a lower surface (312), and a first side surface (313) connected to the upper surface and the lower surface, an electric signal slot (314) being formed on the first side surface, and the electric signal slot being used for coupling with an electric signal terminal (134) of the optical module; and at least two first pins (315), one ends of the at least two first pins being located on the upper surface, the other ends thereof extending from the interior of the base to the lower surface, and the at least two first pins being used for coupling to an electronic device. The electric connection socket can be applied to various interface modules comprising the optical module and an electric port module, and is configured to support an interface module to supply power to the electronic device by using an Ethernet power supply technology while maintaining an original signal transmission function, so that the electronic device does not need to be additionally provided with a POE interface and then the size of the electronic device is reduced.