The invention relates to a PTCD (Percutaneous transhepatic cholangiodrainage) auxiliary machinery automatic device. In the clinical PTCD process, medical workers are damaged by X rays, thus the invention provides a manipulator which assists to complete the PTCD. The PTCD auxiliary machinery automatic device consists of an apparatus control platform, a mechanical arm, a photographing device, a special cable, a pressure sensor and a control terminal. When the PTCD auxiliary machinery automatic device is in use, the apparatus for fixing the PTCD remotely controls the mechanical arm in a corresponding position of a control support through a control system after the puncture is carried out manually so that the mechanical arm clamps, relaxes, moves forwards and backwards and do various actions which are usually carried out under X-ray monitoring to assist and complete the PTCD operation. In the invention, the relevant apparatuses for various PTCD are fixed by the mechanical device to complete the motion of the apparatus through the mechanical arm so that the medical workers can remotely control to realize a long-cherished wish that the medical workers can protect themselves against hurtby X rays in the PTCD process.