The present invention provides a self-propelled crushing machine in which a crushed material having a widely desired grain size can be obtained, a degree of freedom for automatically controlling a rotary tab and a rotary crusher can be preferably improved, and a crushing having a high efficiency can be performed. Accordingly, in a self-propelled crushing machine in which a rotary crusher (1) and a rotary tab (3) for introducing a material to be crushed thrown from an outer portion to the rotary crusher are provided on a self-propelled truck (4), and the material to be crushed is crushed by the rotary crusher and freely discharged to the outer portion, there are provided target crushing rotational speed setting means (5) for setting a target crushing rotational speed (Nhm) of the rotary crusher (1), actual crushing rotational speed detecting means (12) for detecting an actual crushing rotational speed (Nh) of the rotary crusher, crusher drive means (10) for setting the rotary crusher to be freely rotated, and control means (16) for inputting a target crushing rotational speed (Nhm) from the target crushing rotational speed setting means, inputting the actual crushing rotational speed (Nh) from the actual crushing rotational speed detecting means and outputting a crushing rotation control signal (Nhn) for maintaining a relation Nh−Nhm=0 to the crusher drive means by comparing them.