Special ultra-high safety door for low background lab

The invention discloses a special ultra-high safety door for a low background lab. The special ultra-high safety door comprises a radiation-proof door body, a door frame, an upper guide rail and a lower guide rail, wherein the upper guide rail and the lower guide rail are located on the upper side and the lower side of the door frame correspondingly. A door port is formed in the door frame, the upper side and the lower side of the radiation-proof door body are connected with the upper guide rail and the lower guide rail to achieve sliding, bending parts are arranged at the periphery of the door port and the radiation-proof door body correspondingly, and the bending part at the door port is in lapping joint with the bending part of the radiation-proof door body so that a gap becomes zigzagwhen the radiation-proof door body is closed. Improvement is made on the gap between the door and the door frame, bending cooperation is added, so that the cross section of the gap between the radiation-proof door body and th