Junction box

The utility model discloses a junction box which comprises a shell, a circuit board is arranged in the shell, the shell is provided with an input and output interface, a BNC interface, a dial switch and a spring wiring terminal which are electrically connected with the circuit board, the shell is further provided with a guide rail buckling device, and the guide rail buckling device comprises a connecting plate used for being installed on the shell. Side plates perpendicular to the connecting plate are arranged on the two sides of the connecting plate, first clamping hooks are arranged on the side plates, a supporting plate is arranged between the two side plates, a spring is connected to the supporting plate, a sliding plate is connected to the other end of the spring, a second clamping hook is arranged on the sliding plate, a clamping groove used for clamping a guide rail is formed between the first clamping hook and the second clamping hook, and a guide rod is arranged on the lower end face of the sliding p