The invention relates to the technical field of wind power generation, and discloses a wind turbine blade web plate hoisting method. The wind turbine blade web plate hoisting method comprises the following steps: S1, after a web plate is demolded and shaped, fixing a U-shaped block from the locating length of 4 m of the web plate in a mold along the length direction at a preset distance; S2, before the web plate is hoisted, selecting hoisting tools matched with the width size of the inner layer according to the widths of gaps between the inner sides of front edge web plates and rear edge web plates, which correspond to three regions, i.e. the blade root, the blade body and the blade tip, of the web plate; S3, mounting the hoisting tool in the blade root region corresponding to the web plate; S4, repeatedly performing the step S3 on the blade body and the blade tip regions corresponding to the web plate so as to mount the hoisting tools in the blade body and the blade tip regions; S5, fixing the three hoisting tools on a travelling crane, and hoisting the web plate to an adhesion region through the travelling crane; and S6, after the web plate is placed on the shell, taking down the hoisting tools. Compared with the conventional method for hoisting the web plate in a binding manner, the wind turbine blade web plate hoisting method has the advantages that the labor intensity of an operator is alleviated, the production efficiency is improved, and the product quality is guaranteed.