The invention discloses an irradiation experimental device for a pulse reactor. A radial duct is formed in the pulse reactor. The radial duct comprises a duct outlet. A neutron trap is arranged inside the radial duct; a shielding body is arranged outside the radial duct; and a passing hole is formed in the shielding body. The irradiation experimental device comprises a movable shielding cover, a shielding storage rack, a double-screw synchronous drive mechanism and an elevator, wherein the shielding storage rack is arranged at a position, which avoids an area of the passing hole, above the shielding body; the shielding storage rack is used for placing shielding irradiation cavities of different specifications; the elevator comprises an elevator car; and when the elevator car is located in the bottom-most layer, an opening of the elevator car is opposite to the duct outlet. According to the irradiation experimental device disclosed by the invention, the double-screw synchronous drive mechanism is used to drive the elevator car to move, so that automatic transfer and storage can be achieved in the shielding storage rack and the duct outlet, thereby achieving replacement and storage of a plurality of sets of experimental devices in a small experimental space, and also ensuring the radiation protection safety of laboratory personnel.