Portable levelness detector for highway construction

The utility model relates to a portable levelness detector for highway construction, which comprises a support frame, a mounting frame is arranged at the upper end of the support frame, a cross rod is rotatably arranged on the mounting frame, a threaded hole is formed in the lower end of the support frame, a cushion block is arranged in the threaded hole, the cushion block is matched with the threaded hole through threads, and the cross rod is rotatably arranged on the mounting frame. A mounting groove is formed in the middle of the transverse rod, a pointer is rotatably arranged in the mounting groove, whether the surface of a road is horizontal or not is judged through swinging of the transverse rod, the transverse rod is hollow, an extension rod is slidably arranged in the transverse rod, a first limiting hole is formed in the transverse rod, and a second limiting hole is formed in the transverse rod. A plurality of first limiting holes are formed in the cross rod, a plurality of second limiting holes matc