The invention discloses a coordinated loading device and a measurement method for an axial force and a bending moment of main material angle steel of a power transmission tower and relates to the technical field of the coordinated loading methods and devices for the axial force and the bending moment of the main material angle steel of the power transmission towers and the measurement methods. The device comprises left and right counterforce walls which are vertically fixed on the ground, wherein four hydraulic cylinders are mounted at the inner side of one counterforce wall; a rigid connecting plate is fixed at power output ends of the hydraulic cylinders; connecting angle steel is fixed on the rigid connecting plate; the connecting angle steel is fixedly connected with one end of each of the four pieces of main material angle steel of a tower model through a bolt; the other ends of the four pieces of main material angle steel of the tower model are fixedly connected with the other counterforce wall; a cushion layer is arranged between the connecting angle steel and the main material angle steel; four strain gauges are stuck on two legs of each piece of the main material angle steel according to a certain rule. According to the device disclosed by the invention, the main material angle steel is eccentrically loaded and coordinated loading of an axial force and a bending moment on the main material angle steel of the power transmission tower is realized.