Chassis rotatable type simple water pile rotary drilling rig

The invention relates to a chassis rotatable type simple water pile rotary drilling rig which is composed of a base (1) and a working device (2), wherein the base (1) comprises a lower chassis (3), a bearing (4), a linking device (5) and an upper chassis (6); the working device (2) comprises a mast assembly (7) and a power head (8); the mast assembly (7) structurally comprises a mast (9), a support rod (10), a pulley yoke (11), a steel wire rope (12) and a motor (13); the bearing (4) in the structure of the base (1) is connected with the linking device (5), so that the bearing (4) can be driven to rotate by the linking device (5), the upper chassis (6) can rotate so as to drive the mast assembly (7) to shift partially and lastly the power head (8) can achieve the moving purpose. The chassis rotatable type simple water pile rotary drilling rig has the advantages of simple structure, convenience in operation, high construction efficiency, capability of preventing the power head unable to move and increasing the safety and accuracy of piling, and the like.