The invention discloses a method for calculating shear slippage of a hydraulically created fracture on a shale formation. The method comprises the following steps in sequence: (A) calculating a shear strain modulus K and a Kolosoy constant k of a shale; (B) calculating normal stress sigman and shear stress Tau on the wall surface of the hydraulically created fracture; (C) judging whether the hydraulically created fracture has the shear slippage according to pressure of fluid in the fracture and a calculation result obtained in the step (B); (D) calculating the shear slippage of the fracture according to a judgment result obtained in the step (C). The method can judge whether the hydraulically created fracture formed in a fracturing process has the shear slippage according to a destroy form of formation rocks, and calculate the shear slippages of different positions on the fracture based on the judgment on the premise that the length, the angle and the friction coefficient of the fracture and the mechanical parameters of the shale formation rocks are given; the principle is reliable, and the operation is simple; an important guiding basis is supplied to optimization of hydraulically fracturing construction parameters of the shale formation.