Motor vehicle pollution detector

The utility model relates to a motor vehicle pollution detector which comprises a walking trolley, a vertical frame is fixedly installed on the walking trolley, an installation frame is fixedly installed on the top of the vertical frame, a detection assembly is arranged on the installation frame, and a smoke collecting assembly is arranged at the input end of the detection assembly. The detection assembly comprises a detector fixedly mounted on the mounting frame, a display is fixedly mounted at the top of the detector, and a filter box movably connected with the output end of the detector is clamped to the position, located on the right side of the detector, of the top of the mounting frame. According to the motor vehicle pollution detector, when the tail gas pipe is in butt joint, the butt joint pipe can be more tightly arranged on the tail gas pipe in a sleeving mode through the elasticity of rubber, the connectivity of the butt joint pipe and the tail gas pipe is improved, detected tail gas is discharged