The utility model provides an inspection shaft cover opening device, carry the pull rod that draws the portion including having, still include the drag hook be connected through force sensor and pull rod, and force sensor communication connection's alarm device, force sensor is used for measuring the pulling force that the drag hook was applyed and feeds back to alarm device, the pulling force that alarm device is used for being applyed when the drag hook exceedes reports an emergency and asks for help or increased vigilance when setting for the threshold value. The utility model discloses an it measures inspection shaft lid and opens the in -process and apply the pulling force on the drag hook to set up the pulling force inductor on the pull rod to showing the pulling force data in real time through the display screen on the alarm device, working as the pulling force of applying when exceeding the threshold value that sets up, alarm device will send the reputation warning signal.