The present invention relates to a milling and drilling machine, including: a rigidity machine frame (1), which comprises an upper crossbeam (5); a processing unit (23), which can move by means of a motor along at least two coordinates axes at the front of the crossbeam (5), and is arranged with a working main axis (26) of a rotary drive for exchanging tool; as well as a working table (55), which is installed at the front of the machine frame (1) and moves horizontally along at least one coordinates axis by means of a motor, also comprises a table-board for gripping at least one working piece. According to the present invention, the machine frame (1) comprises two rigidity side walls (2, 3) connecting with each other through the upper crossbeam (5) and a front end (8).