Steel support unloading device

The utility model relates to a steel support unloading device which comprises a base, a pair of symmetrically-arranged trapezoidal sliding blocks and a top seat which are sequentially arranged from bottom to top. The base is provided with first inclined sliding ways in sliding fit with the lower waist faces of the trapezoidal sliding blocks. The top seat is provided with a second inclined slide way in sliding fit with the upper waist faces of the trapezoidal sliding blocks, and a horizontal lead screw assembly arranged between the base and the top seat is arranged between the pair of trapezoidal sliding blocks. The ladder-shaped sliding block, the first inclined sliding way and the second inclined sliding way are used for achieving lifting motion of the top seat, the horizontal lead screw assembly is used for assisting in adjusting and self-locking, an assembling structure is obtained, and the purposes of being convenient to disassemble and assemble and capable of being used repeatedly are achieved while the