Constructional engineering measuring device

The utility model relates to a constructional engineering measuring device, which comprises a measuring instrument, a mounting seat, supporting legs and a supporting and locking mechanism, a measuring instrument is mounted on the mounting seat; a plurality of first hinge seats are arranged on the outer wall of the mounting seat at equal intervals, supporting legs are hinged to the first hinge seats, and second hinge seats are arranged on the inner sides of the supporting legs; the supporting and locking mechanism comprises a locking disc, a locking plate, a hinge rod and a clamping block, third hinge seats in one-to-one correspondence with the second hinge seats are arranged on the outer wall of the locking disc, the upper end and the lower end of the hinge rod are hinged to the second hinge seats and the third hinge seats respectively, and the clamping block is arranged at the lower end of the hinge rod; the lower end face of the locking disc is provided with clamping grooves matched with the clamping blocks