The utility model discloses a multifunctional pipe says corrosion monitor, directly monitor the subassembly including the conventional construction problem subassembly of pipeline, epitome subassembly and pipeline wall thickness, the conventional construction problem subassembly of pipeline respectively is equipped with a flange I including setting up welding seam evaluation module, pipeline material evaluation module, thermal treatment evaluation module and the external coating evaluation module on emulation pipeline I at the both ends of emulation pipeline I, the epitome subassembly includes the epitome pipe that monitoring pipe said, the both ends of managing in the epitome respectively are equipped with a flange II, the pipeline wall thickness is directly monitored the subassembly and is included that the wall thickness that connects gradually through data transmission cable directly monitors probe, data analysis system and data analysis system, and the wall thickness is directly monitored the probe and is set up on the surface of emulation pipeline II, respectively is equipped with a flange III at the both ends of emulation pipeline II. The utility model discloses can obtain the pipeline omnidirectional information of corroding, the corruption circumstances of reaction pipeline that can be accurate to can develop the corrosion protection work of pipeline in view of the above.