The utility model discloses a lifting cylinder structure of a shovel blade, and particularly discloses a lifting cylinder of a shovel blade of a bulldozer. The lifting cylinder of the shovel blade of the bulldozer comprises a cylinder rod, a guide sleeve and a piston. The guide sleeve is arranged on the left side of the cylinder rod, a first valve stem is arranged at the upper end of the right side of the cylinder rod in the guide sleeve, a second valve stem is arranged on the right side of the first valve stem, the first valve stem and the second valve stem penetrate the piston to be connected with each other, an oil inlet is formed in the upper side of the right end of the guide sleeve, and an oil outlet is formed at the lower end of the left side of the guide sleeve. The lifting cylinder has the advantages that the lifting cylinder is simple in structure and convenient to use, a hood protecting effect can be effectively realized, impact generated when the shovel blade ascends or descends quickly can be reduced, and the integral service life of the bulldozer can be prolonged.