Differential settlement detection device for widened pavement

The invention discloses a differential settlement detection device for a widened pavement, and belongs to the technical field of pavement settlement detection. Comprising a first detection column arranged on an old road surface and a second detection column arranged on a widened road surface; the lower end of the first detection column is arranged on a first supporting platform capable of being leveled, the upper end of the top is connected with a semi-sphere angle device, and height scale marks are further arranged on the outer wall of the first detection column. A second detection column is arranged on the second supporting platform in a contact mode through an arc-shaped protruding base at the lower end and locked and fixed through a screw, a settlement rod is slidably arranged in the middle of the upper end of the second detection column, and the other end of the settlement rod is rotationally arranged on a semi-sphere angle device through an arc-shaped groove; a horizontal rod is fixed on the outer wall