Road soft foundation monitoring device

The utility model relates to the technical field of highway subgrade monitoring equipment, in particular to a highway soft foundation monitoring device. Comprising a first rectangular frame, two U-shaped clamping blocks are rotatably mounted on each of the two sides of the first rectangular frame, telescopic supporting legs are hinged to the U-shaped clamping blocks, a second rectangular frame is rotatably mounted in the first rectangular frame, a third rectangular frame is rotatably mounted in the second rectangular frame, and a mounting block is fixed in the third rectangular frame and penetrates through the third rectangular frame; a supporting rod is arranged on the mounting block, a soft foundation monitoring assembly is arranged at the top of the supporting rod, a falling rod is welded to the bottom of the mounting block, circular grooves are formed in the inner walls of the two sides of the first rectangular frame and the second rectangular frame, and the four circular grooves are distributed in a cros