Filter and ultraviolet sterilization device thereof

The utility model provides a filter and an ultraviolet sterilization device thereof, the ultraviolet sterilization device is arranged on the filter, and the ultraviolet sterilization device comprises a metal shell, an insulating barrier piece, a circuit board, an ultraviolet sterilization light source, a lead and a light-transmitting cover. The outer periphery of the metal shell is provided with an installation structure connected with the filter, and a light source installation groove and a wire penetrating hole are formed in the metal shell; the insulation blocking piece is fixed in the light source mounting groove, the circuit board is located on the insulation blocking piece, the ultraviolet sterilization light source is arranged on the circuit board, a vertical through hole is formed in the insulation blocking piece, and the wire penetrates through the wire through hole and the vertical through hole to be welded to the circuit board; and the light-transmitting cover covers the top of the light source mou