The invention provides a hoisting method of an L-shaped space truss. The hoisting method comprises the following steps that (1), a solid model of the L-shaped space truss is built; (2), the center-of-gravity position of the L-shaped space truss is determined; (3), the intersection point of the gravity center line passing through the gravity center of the L-shaped space truss in an installation in-place state and a truss chord serves as a first hoisting point; (4), a second hoisting point is determined according to the overturning and rotating direction of the truss, and after the overturning state is completed, the connection line of the first hoisting point and the second hoisting point is located above the gravity center; (5), the first hoisting point is hoisted through a main crane, the second hoisting point is hoisted through an auxiliary crane, and the truss is hoisted and overturned to be in a state perpendicular to the horizontal plane; and (6), the main crane and the auxiliary crane lift the truss simultaneously, the truss is rotated to be in a state of installation in-place, and the main crane lifts the truss to the installation position. The hoisting method can improve the hoisting efficiency, decrease the number of cranes, save the hoisting expenses and ensures stability and safety of components in the hoisting process.