Drilling rig and rig frame thereof

The invention discloses a rig frame of a drilling rig. The rig frame of the drilling rig comprises a rig frame front part and a rig frame rear part which are mutually connected, wherein the rig frame front part is of a channel beam structure, and the rig frame rear part is of an integral box-type structure. The integral box-type structure is free of the problem of rig frame connection, so that the problem of connecting misplacement of a main rig frame and a secondary rig frame in the prior art is resolved. In addition, the bending resistance and the torsion resistance of the integral box-type structure are high, the inertia moment of the cross section is strengthened, the stress of the whole drilling rig is improved, and the working stability of the rig frame is improved. Due to the fact that inertia moment of the cross section is decided by the size of a box and has little relationship with plate thickness, after a double-layer connecting structure combined by a mediate and small box and channel beams in the prior art is changed into the larger integral box-type structure, on the premise that the rigidity and the strength are guaranteed, the wall thickness of the rig frame rear portion can be appropriately reduced, and the weight of the rig frame is lowered. In addition, after the rig frame rear portion is of the integral box-type structure, an operator does not need to buy a universal chassis to modify the rig frame, and production cost is lowered.