The present invention relates to an automatic grinding machine (1) for end mills for wood (7), programmable with optical reading of the geometric characteristics and computerized sharpening, constituted by a compact structure which can be rested on a fixed bench or on a movable trolley for service on machines for chip-forming machining. The grinding machine (1) has a computerized control panel (2) for CNC management, which actuates in cooperation and coordination various assemblies adapted for automated sharpening. A first optical reading assembly (5) with an arm (4) for automatic movement from an inactive position (3) to a position for detecting the geometric characteristics of the end mill (7). A second assembly (6) for holding the end mill (7), which is horizontal and longitudinal with respect to the machine, capable of moving on command forward and backward and/or simultaneously rotate the mill about its own axis. A third assembly (10) for supporting a cup grinding wheel (11) is mounted on the vertical frame (9), which rests on a circular and horizontal base capable of rotating on said plane. The grinding wheel can arrange itself above and below, longitudinally to the mill and/or in front of it, both on the right side and on the left side, in order to be able to sharpen end mills for wood of the type with left-handed helix and of the type with right-handed helix.