Image forming device and paper amount detection mechanism and method

The invention provides an image forming device and a paper amount detection mechanism and method. The paper amount detection mechanism is used for being matched with a paper storage mechanism on the image forming device, the paper storage mechanism comprises a frame body and a movable lifting plate, the lifting plate is arranged in the frame body, and a grounding terminal is arranged in the frame body and moves along with the movement of the lifting plate. The paper amount detection mechanism comprises a control board, detection circuits and a control unit, wherein the detection circuits and the control unit are arranged on the control board; the detection circuits are used for making contact with the grounding terminal in the moving process of the lifting plate; and the control unit is connected with the detection circuits, is used for acquiring voltage information of the detection circuits, and determines the paper amount information in the paper storage mechanism according to the voltage information of the