The present invention relates to a connector assembly structure of a terminal used for converting connecting wires. A terminal base is disposed on a frame of a cooling system, and the terminal base has a socket into which a first connector is inserted. The first connector is connected to the connecting wires that are connected to a stator of a motor, and has at least one hook on the periphery thereof. The socket has a releasing hole that corresponds to the hook and engages with the hook so that the first connector is detachable. Additionally, a second connector is adjacent to the first connector, and is connected to the connecting wires to be converted. The electrically interconnection between the first connector and the second connector can satisfy the requirement of converting various connecting wires.