The invention discloses a cutting method of a milling type micro type cutter. The method comprises the following steps of (a) semifinishing with a first ball-end mill and (b) finish machining with a second ball-end mill. Finish machining with the second ball-end mill comprises the following steps of (b1) back chipping manufacturing procedure executing and (b2) curved surface finishing. According to the method, before the second ball-end mill is used for machining, an even and high-quality to-be-machined surface can be provided for machining of the second ball-end mill through the adoption of semifinishing design, and therefore the service life of the second ball-end mill is prolonged; in the finish machining process, the machining allowance at the position of a first arc groove bottom of a workpiece is reduced by utilizing the back chipping manufacturing procedure, a third V-type machining surface is machined through curved surface finishing, cutting counter-acting force borne by the second ball-end mill in the finish machining process can be reduced, the mill breakage phenomenon can be reduced, and therefore through reasonable setting of the steps, the service life of the second ball-end mill can be ensured, and the surface machining quality of the workpiece is improved.