The invention discloses an automobile body three-dimensional curved surface detection system based on laser grids, and aims to solve the problem of automobile body three-dimensional curved surface detection by employing the laser grids. The automobile body three-dimensional curved surface detection system based on the laser grids mainly comprises an underframe (1), lasers (2), clamps (3), an L-shaped board (4), an adjusting bolt (5), and a base (6). According to the automobile body three-dimensional curved surface detection system based on the laser grids, the occupied space is small, the structure is simple, the detection precision is high, the operation is simple, the installation is easy, the cost is low, and the performance is reliable.