The invention discloses a radiation-proof electric door for a hospital radiation room and a mounting method of the door, and relates to the technical field of radiation prevention. The radiation-proofelectric door for the hospital radiation room comprises a mounting shaft, two rotary door bodies and a driving mechanism for driving the mounting shaft to rotate, wherein an accommodating space witha lateral opening is formed between the two rotary door bodies; a surrounding plate is arranged on one side of each the rotary door body; the two rotary door bodies can rotate in the forward directionor the reverse direction; the lateral opening of the accommodating space is opposite to or staggered with the surrounding plate; and the surrounding plate can rotate around the axial direction of a rotary shaft and block one of the rotary door bodies from the side edge of the mounting shaft. The radiation leakage of the radiation-proof electric door for the hospital radiation room is small and has a good radiation-proof effect. The mounting method of the radiation-proof electric door of the hospital radiation room is that the mounting shaft connected with the rotary door bodies is mounted onone vertical edge of a reserved door frame of the radiation room, and the rotary shaft of the surrounding plate is mounted on the other vertical edge. The mounting method is simple and easy to maintain.