The invention discloses an artificial defecation device used after rectal cancer radical operation. The artificial defecation device comprises a rectum prosthesis, a pressure sensor, an extrusion mechanism, an artificial anus and an anus plugging mechanism, the artificial anus is arranged at one end of the rectum prosthesis, the pressure sensor is arranged at one end, away from the artificial anus, of the rectum prosthesis, the extrusion mechanism is arranged on the rectum prosthesis, the anus plugging mechanism is arranged in the artificial anus and connected with the pressure sensor, and anindicating unit is arranged on the anus plugging mechanism and used for indicating pressure. According to the device, original rectum and anal tube excrement storage and defecation control functions are simulated through the artificial prosthesis, the defecation is powerful, and the problems of ischemia, ulceration, corrosion and infection are avoided.