The invention discloses a method for lifting a four-direction forklift by using a lifting device. The lifting device comprises two front hydraulic cylinders and two rear hydraulic cylinders; end portions of piston rods of the two front hydraulic cylinders are connected with front supporting blocks, respectively, while end portions of piston rods of the two rear hydraulic cylinders are connected with rear supporting blocks, respectively; the two front supporting blocks are connected through a front forklift supporting arm, while the two rear supporting blocks are connected through a rear forklift supporting arm. By using the method, the following advantages can be achieved: 1, when the four-direction forklift needs to transport goods at a higher position, the four-direction forklift is lifted up by using a lifting mechanism, and then the forklift performs operations on the goods, and therefore, loading and transportation of the goods at the higher position are realized; and 2, the lifting mechanism realizes stable supporting for the four-direction forklift.