A stone milling machine head comprises a shell, a revolution mechanism, a rotation mechanism, a bias mechanism, a water block assembly, a drill assembly. The revolution mechanism is composed of a revolution shaft and a big belt pulley. The rotation mechanism is composed of a rotation shaft and a small belt pulley. The bias mechanism is composed of an upper bearing box, a lower bearing box, an upper two-way turntable and a lower two-way turntable. The revolution shaft is installed in an inner liner of the shell. The rotation shaft is arranged in a cavity of the revolution shaft. The upper two-way turntable is installed in the upper reentrant of the shell. The upper bearing box is installed between a front positioning piece and a back positioning block in a sliding chute of the upper two-wayturntable. The big belt pulley is fixed on the top of the upper two-way turntable. The small belt pulley is installed at the upper part of the rotation shaft. The water block assembly is connected onthe top of the rotation shaft. The lower two-way turntable is arranged in the lower reentrant of the shell. The lower bearing box is installed between the front and back positioning pieces in the sliding chute of the lower two-way turntable. A drill assembly is jointed with the bottom end of the rotation shaft. The product drills and opens up holes by the combination of rotation and revolution with high efficiency, high precision, low cost and long service life of the drill bit.