The utility model discloses a connection system for a transmission tower and ground wires. The system comprises the transmission tower, as well as an ordinary ground wire and a composite fiber-optic overhead ground wire which are arranged on two sides at the top end of the tower, the composite fiber-optic overhead ground wire is fixed on one side of the tower through a ground wire insulator string, the connection part of the composite fiber-optic overhead ground wire is connected with a strain wire clamp, and the strain wire clamp is fixed on the tower. The construction of the utility model involves fixing the composite fiber-optic overhead ground wire onto the tower through the ground wire insulator string, and in doing so the composite fiber-optic overhead ground wire is insulated segment by segment through the ground wire insulator string and is only grounded at the connection part of two neighboring composite fiber-optic overhead ground wire coils, together with the tower through the strain wire clamp. The utility model can also apply to a fiber-optic composite insulator which can be insulated segment by segment and grounded at one point, rather than being subject to the traditional method, e.g. being grounded tower by tower. The utility model has the advantages of reducing the occurrence of circumfluence arising in the ground wires, greatly reducing loss, and curtailing the cost of electrical production.