The invention discloses a device for detecting the deformation of an exhaust pipe of an automobile, and the device comprises a first detection supporting block, a second detection supporting block, athird detection supporting block, and a fourth detection supporting block. The first, second and third detection supporting blocks are respectively provided with a lining sleeve and a supporting column. The first detection supporting block is provided with a base, and the base is provided with a substrate. The substrate is provided with a shaft ring pedestal, and the shaft ring pedestal is provided with a tubular shaft ring. One side of the substrate is provided with a quick clamping board, and the quick clamping board is provided with a quick clamp. The supporting columns of the first and second detection supporting blocks are respectively provided with a bracket which is provided with a connecting plate. Each connecting plate is provided with a supporting plate, and each supporting plateis provided with a miniature linear guide rail. The fourth detection supporting block is provided with a tail clamp. The device is convenient in detection, is reasonable in structure, is simple in operation, is low in work intensity, is high in detection speed, and is high in work efficiency.