Surface flatness detection device

The utility model relates to the technical field of flatness detection, and discloses a surface flatness detection device, which comprises a detection table, the top end of the detection table is fixedly connected with a mounting rack, the bottom end of the mounting rack is fixedly connected with a laser detector, the top end of the detection table is fixedly connected with a bearing seat, and the bearing seat is fixedly connected with the laser detector. The top end of the bearing seat is fixedly connected with a clamping assembly, the top end of the detection table is fixedly connected with a transmission plate, the top end of the detection table is fixedly connected with two rotating plates, the right ends of the rotating plates are rotatably connected with threaded rods extending to the right ends of the transmission plates, and the outer sides of the threaded rods are fixedly connected with transmission assemblies. And the outer side of the threaded rod is in transmission connection with a moving sleeve