Slope measuring device for building roof

The utility model belongs to the technical field of building construction equipment, and discloses a gradient measuring device for a building roof, which comprises a shell, and a dial is fixedly sleeved in the shell. According to the utility model, the iron block, the rigid spring and the magnetic block are arranged, the pull rod is pulled to drive the magnetic block to move through the circular block so as to relieve the magnetic effect on the iron block, then the circular ring is driven to move and the rigid spring is stretched, and at the moment, the iron block drives the rotating rod, the sleeving rod and the pointer to rotate due to gravity; the pointer rotates along the front surface of the dial until stopping, and then the pull rod is loosened, so that the rigid spring drives the magnetic block to move to be magnetically connected with the iron block by pulling the circular ring, the magnetic block fixes the iron block and the pointer, and the slope of the roof can be judged by observing the position o