The utility model provides a multi -functional full -automatic telescoping device monitor, at least includes flexible automatic measuring device, the automatic recorder of temperature and data reception processing device, flexible automatic measuring device contains power, switch, constant ohmic resistance, takes scale slide rheostat, real - time voltage table and the 2nd real - time voltage table, take scale slide rheostat to fix the one end at the telescoping device that awaits measuring, the slide rheostat gleitbretter is fixed at the other end, and real - time voltage table connects in parallel in constant ohmic resistance's both ends, and the 2nd real - time voltage table connects in parallel at the both ends of taking scale slide rheostat, the automatic recorder of temperature contains humiture record appearance, data reception processing device is connected to real - time voltage table, the 2nd real - time voltage table and humiture record appearance, therefore, the utility model discloses can effectively monitor the expansion joint width, can clear, directly perceived, accurate reaction expansion joint situation of change to this device simple structure, stable performance,convenient operation.