Rotary drilling rig

The utility model discloses a rotary drilling rig, which comprises a crawler device (1), a chassis upper truck (3) positioned on the crawler device (1), a cab (8), a mast (18) mounted on the chassis upper truck (3), a power head (16) mounted on the mast (18), a drilling rod (12) driven by the power head (16), a drilling tool (14) mounted at the end part of the drilling rod (12), and a first driving device (6); and a second driving device (9) and an electric control device (2) used for controlling the first driving device (6) and the second driving device (9) are arranged on the chassis upper truck (3). Through the electric control device (2), the conversion of electric power to fuel power between the first driving device (6) and the second driving device (9) can be realized.