The utility model discloses a hardware socket for an optical composite insulator. The hardware socket comprises a hardware socket body, a pressing connection region is arranged at one end of the hardware socket body and is matched with a core rod of the insulator (the optical composite insulator), and a tail fiber outlet is formed at the other end of the hardware socket body and is communicated with the pressing connection region. According to the utility model, as the tail fiber outlet is added on the hardware socket body, a tail fiber can penetrate out of the hardware socket to form a loop to transmit signals, the structure of the hardware socket is simple, and the hardware socket is applicable to the optical composite insulator; as the tail fiber outlet is provided with a sealing threaded hole with taper, a fusing contact of the tail fiber behind the outlet can be protected and sealed conveniently and is not influenced by outdoor weather conditions; and as a tail fiber bending region in which the tail fiber can be bent for transition is added between the tail fiber outlet and the pressing connection region, the tail fiber is provided with a bending radius by which the tail fiber is not broken, and the tail fiber is led out of the tail fiber outlet after being subjected to buffering transition through the tail fiber bending region, therefore the situation that the tail fiber is broken because of an overlarge bending angle can be avoided. The hardware socket is applicable to the optical composite insulator.