Brake disc flatness detection device

The utility model relates to the technical field of brake disc flatness detection, in particular to a brake disc flatness detection device, which comprises a lifting telescopic assembly, a clamping fixing assembly, a detection assembly and a clamping adjusting assembly, and is characterized in that the detection assembly comprises a supporting plate; a first hole is formed in the supporting plate in a penetrating mode, a first baffle is installed on the vertical rod, a first spring is arranged on the first baffle, an indicator light switch is hung below an L-shaped plate, a roller is rotationally installed at the bottom end of the vertical rod through a bearing, and a second motor can drive a fixed clamping assembly installed on a rotating disc to rotate after being started. When the surface of the brake disc is uneven, the surface of the brake disc fluctuates back and forth, the roller drives the vertical rod to move upwards after being subjected to upward pushing force, the top end of the vertical rod extru