The invention provides a front-to-rear continuous type heating method for an annealing furnace, relates to the heating method suitable for the annealing furnace and aims at providing the front-to-rear continuous type heating method for the annealing furnace. According to the method, the heating mode of the annealing furnace is changed into a front-segment heating mode, short-furnace long-time use is achieved, the soaking time is prolonged by increasing the length of a soaking segment, grains of strip steel fully grow up in the furnace, and the mechanical performance of the strip steel is optimized. The front-to-rear continuous type heating method for the annealing furnace comprises the following steps that the front-to-rear arrangement sequence of radiant tubes in the annealing furnace is A1, A2, A3...An..., the total heating output of the annealing furnace is x, the heating output of the radiant tubes is y, and the function relation expression between the heating output yn of the radiant tube An and the total heating output x of the annealing furnace is shown in the specification, wherein n' is the number of the radiant tubes, x is larger than or equal to 0 and small than or equal to 100%, y is larger than or equal to 0 and smaller than or equal to 100%, n is larger than or equal to 1, and n' is larger than 1.