Coal mine subsidence area surface deformation monitoring device

The utility model discloses a coal mine subsidence area earth surface deformation monitoring device, which belongs to the coal mining subsidence area monitoring field, and comprises a telescopic frame with an open bottom, the bottom of the telescopic frame is provided with a plurality of reinforcing assemblies, the inner part of the telescopic frame is slidably connected with a sliding plate, and the sliding plate is provided with a plurality of through holes. And the bottom of the sliding plate is fixedly connected with a straight toothed plate used for synchronously driving the multiple reinforcing assemblies, the top of the telescopic frame is slidably connected with a U-shaped frame, and a GPS receiver is detachably installed at the top of the U-shaped frame. Through the arrangement of the adjusting assembly, the U-shaped frame and the sliding plate can be synchronously driven to move oppositely or away from each other, then the GPS receiver can be synchronously driven to be adjusted up and down, the rein