Motor vehicle exhaust detecting device

The invention discloses a motor vehicle exhaust detecting device. The motor vehicle exhaust detecting device comprises an exhaust analyzer and an exhaust collecting chamber, the lower end of the exhaust collecting chamber is communicated with a communicating chamber which is communicated with an exhaust guide-in pipe and an exhaust transmission pipe, the communicating chamber is provided with a flow control device, and the upper end of the exhaust collecting chamber is slidingly connected with a cover plate which is provided with a channel; the upper end of an adjusting plate is provided witha gas pipe, the adjusting plate is communicated with the gas pipe through a through hole, the gas pipe is communicated with the exhaust transmission pipe, and the outlet of the exhaust transmission pipe is connected with an exhaust purifying tank inside which exhaust purifying agent is filled. According to the motor vehicle exhaust detecting device, vehicle exhaust is input into the communicatingchamber through the exhaus