The utility model provides a sighting telescope reticule plate lighting continuous brightness regulating handwheel for a gun. The sighting telescope reticule plate lighting continuous brightness regulating handwheel comprises a handwheel, an elastic plate, an upper insulating board, a carbon film resistance, a movable contact, a fixed contact, a lower insulating board and wiring terminals, and is characterized in that the fixed contact is contacted with the carbon film resistance, the movable contact can slide on the carbon film resistance, the upper insulating board is arranged in the handwheel, the carbon film resistance is fixed on the upper insulating board, a pressing plate is arranged on the upper portion of the upper insulating board, the elastic plate is pressed on a pressing plate, a handwheel cover is connected with the handwheel through screw threads, the wiring terminals are fixed on the lower insulating board, the two connecting wiring terminals are respectively connected with the movable contact and the fixed contact, a screw is fixed on the lower insulating board, the carbon film resistance is of circular arc, the maximum resistance value is 1 kilohm, and the appearance of the carbon film resistance is of ring shape with a notch. The sighting telescope reticule plate lighting continuous brightness regulating handwheel can continuously regulate a regulating resistance within a certain range, further regulates the lighting brightness of a reticule plate continuously, and has simple structure, convenient operation and low cost.