A vertically elevated gate mast with open front that is divided into multiple sections and is assembled section by section from bottom to the top. The first section is an integrated structure, and 2.sup.nd to nth sections are divided into a left part and a right part. Each left and right part is assembled by connecting front upright posts, back upright posts, upper beams, lower beams and brace rods. Corresponding left and right parts are then connected with back beams and brace rods to form each section with beams and brace rods at the left, right and back sides. Lifting and lowering of the mast is realized by drawworks. Installation is performed from the ground, by assembling the left parts and the right parts with the back beams and the brace rods into a shape of gate, and then lifting each section as a whole with a crane.