The invention discloses a making method of a groove type printed circuit board, which comprises the steps of: 1. providing an inner original plate and a high-temperature resisting material; 2. arranging a groove on a non low gummosis prepreg; 3. overlapping the inner original plate and the prepreg and pressing; 4. controlling a spooning bed by using depth and carrying out milling spooning on a pressed circuit board; and 5. removing a module and the high-temperature resisting material in the groove to form a finished product. By using a one-time pressing method, the invention solves the problem of long flow process of making the groove board by pressing twice, overcomes the defect of resin gummosis of the bottom of the groove and the board surface, and avoids the problems of pressing gum filling and independence of the low gummosis prepreg. The groove prepared by using the method has smooth bottom and no pollution, and completely accords with the requirements.