Provided is a dry type connecting method for a concrete slab and a steel beam of a steel-concrete combined beam. The method comprises the steps that A, a positioning formwork is manufactured; B, a steel plate connector is manufactured, specifically, the lower end of a shear force connecting piece is welded to the upper surface of a connecting plate, a connecting rod penetrates into a positioning hole of the positioning formwork so that the connecting rod and the positioning formwork can be fixed temporarily, then the connecting rod is fixedly connected with the lower surface of the connecting plate, temporary fixation of the connecting rod and the positioning formwork is released, and the positioning formwork is removed; C, the steel plate connector and the concrete slab are connected, specifically, the shear force connecting piece is embedded in the concrete slab, and the connecting rod and the connecting plate are exposed; and D, the concrete slab and the steel beam are connected, specifically, the positioning formwork is clamped to an upper flange plate of the steel beam, a connecting through hole is drilled at the positioning hole of the positioning formwork, the positioning formwork is removed, the connecting rod penetrates into the connecting through hole and is fixed to the lower surface of the upper flange plate of the steel beam finally, and the steel-concrete combined beam is formed. By means of the method, the field construction amount and pollution to the environment can be reduced, and the construction speed can be increased.