The invention discloses an anti-deformation metal pipe drilling machine. The anti-deformation metal pipe drilling machine structurally comprises a stand column, a base, a workbench, a metal pipe, a drill bit and a machine body, wherein the stand column is vertically connected with the base, the machine body is fixed to the stand column, the drill bit is installed on the machine body, the workbenchis arranged below the drill bit, the workbench is fixed to the base, and the metal pipe is placed on the workbench. Compared with the prior art, the anti-deformation metal pipe drilling machine has the beneficial effects that through combined arrangement of a supporting device, a clamp, an L-shaped connecting frame, a foundation seat, a sliding rail assembly and a supporting table, the to-be-drilled part can be internally supported, the supporting stability can be greatly improved through the characteristics and hydraulic pressure of a clockwork spring, a metal pipe is effectively prevented from deforming in the drilling process, meanwhile, the device can adapt to supporting of metal pipes with different calibers, and the application range is wide.