The invention relates to the technical field of shielding, and discloses a double-leaf sliding shielding door used for large nuclear magnetic laboratories and nuclear magnetic complex operating roomsduring operation. The double-leaf sliding shielding door comprises a door frame, a unit and double-leaf door leafs; the unit is used for driving the double-leaf door leafs to left-right slide outsidethe door frame, and shielding elastic pieces are arranged at the upper end and the lower end of a main body frame of the door leafs and the unconnected positions of the door leafs; a first door leaf profile and a second door leaf profile which are used in a paired mode are arranged at the joints of the door leafs, the first door leaf profile and the second door leaf profile are of mutually-matchedconcave-convex structures, and the shielding elastic pieces are also arranged at the clamping-connection positions of the concave-convex structures; and a third door leaf profile is arranged on the outer sides of the door leafs, a safety margin is mounted on the outer sides of the door leafs and used for collision preventing, and the shielding elastic pieces adopt airbag driving.