Novel diesel engine waste gas monitor

The invention discloses a novel diesel engine waste gas monitor, and relates to the technical field of waste gas monitors, the novel diesel engine waste gas monitor comprises a shell, a suction fan and a monitoring assembly, the middle end of the inner side of the shell is provided with a first transverse plate, the outer side of the top of the first transverse plate is provided with a motor, and the suction fan is arranged at the output end of the motor. The suction grooves formed in the surface of the suction pipe are distributed in different directions of the surface of the suction pipe with three different cavities as the reference, and the distances between the suction grooves and the diesel engine can be divided into three different distances including the far distance, the middle distance and the near distance. According to the device, the suction grooves at different distances can be covered to collect waste gas at a specific distance from the diesel engine, so that the device can monitor the concentr