The present invention provides a colorectal endoscope with monitoring function, relating to medical machinery through a colorectal method for treatment, in particular to a colorectal endoscope, which comprises a colorectal endoscope, an injection pipe and a waste liquid precipitation pipe. The present invention is characterized in that the colorectal endoscope and the injection pipe are connected with one end of an intestinal cavity; the body of the waste liquid precipitation pipe is provided with a through hole or a connecting device communicated with the internal cavity of the waste liquid precipitation pipe for guiding or covering the injection pipe; the internal diameter of the through hole or the connecting device and the internal diameter of the partial waste liquid precipitation pipe towards the intestinal cavity of the human body are larger than or equal to the maximum external diameter of the colorectal endoscope and the injection pipe which probes into the waste liquid precipitation pipe and the intestinal cavity through the waste liquid precipitation pipe; a conduction lead is embedded in the wall of the injection pipe and the part of the injection pipe which enters the intestinal cavity of human body is provided with a sensor; the conduction lead is connected with the sensor. The present invention ensures the conventional colorectal endoscope has the functions of treatment, waste discharge and real-time monitoring.