The invention discloses an automotive body pose parameter detection system based on monocular vision and aims to solve problems about non-contact visual detection of automotive body pose parameters. The automotive body pose parameter detection system based on monocular vision mainly comprises a camera (1), a circular hole shaped target plate (2) and magnetic gauge stands (3), wherein the camera (1) directly acquires a quadric curve image of circular holes under a coordinate system of the camera, so that the automotive body pose parameters are obtained through matrix transformation from a plane-coordinate system to the coordinate system of the camera, and detection of the automotive body pose parameters is finished. The magnetic gauge stands (3) are adopted to fix the target plate and an automotive body together, rapid mounting and real-time detection of the pose change of the automotive body can be realized, and the test timeliness is improved. The automotive body pose parameter detection system based on monocular vision is simple in structure, high in detection precision, simple and convenient to operate, easy to mount, lower in cost and reliable in performance.