The application discloses a device for monitoring building slope is fixed in insulation ropes by control on the building through the fixer, and insulation ropes perpendicular to horizontal plane, insulation ropes's end-to-end connection heavy object, and insulation ropes's below sets up alarm device, simple, the easy operation of this device control principle utilizes the fixer to fix reservation department at the building with insulation ropes to connect the radio signal send alarm, when not run-off the straight of building, the alarm circuit is in the off state, does not trigger the radio signal send alarm and reports to the police, when the building run-off the straight, the alarm circuit is in the connected state, triggers the radio signal send alarm and reports to the police, has still realized supervisory equipment's informationization, the application of electronic IT simultaneously.