The invention discloses a rolling method for a trough type steel rail. The rolling method comprises the steps that a rectangular billet is rolled into a cap-shaped rolled part in a rough rolling pass, a groove is cut in the head portion of the rolled part in advance, the head portion and the lip portion are separated in advanced, and the stability of the rolling process in followed pass is guaranteed; metal distribution of the head portion and the lip portion is fully finished in a finishing pass; and the size and the shape of the head portion and the size and the shape of the lip portion are stabilized in a finished product final rolling pass to finish the hot deformation process. According to the rolling method, the stability of the product sizes is improved, the shapes are guaranteed, and the product percent of pass and the yield are effectively improved.