Focusing test device

The invention relates to the technical field of cameras, and discloses a focusing test device. The device comprises a test box, a test assembly, a calibration module and a processing module. The test assembly comprises a first backlight plate, a plurality of test pictures and a first moving mechanism. The plurality of test pictures are arranged on one side, facing the lens, of the first backlight plate. The plurality of test pictures are arranged along the first direction, and the sizes of the plurality of test pictures are different. The first moving mechanism is used for driving the first backlight plate to move in the first direction. The calibration module comprises a second backlight plate and a second moving mechanism. The second moving mechanism is used for driving the second backlight plate to move in the first direction. The lens is used for acquiring a reference light brightness image of the second backlight plate and images of a plurality of test pictures. The processing module is used for processi