Provided is a photodynamic therapeutic apparatus comprising a fixed plate, wherein slots are respectively formed in the left side and the right side of the fixed plate, inserting plates are arranged in the slots, the inserting plates can be inserted into the slots and can move along the slots, the outer ends of the inserting plates are respectively and fixedly provided with connecting plates, theinner ends of the inserting plates are fixedly connected with the inner walls of the slots through a spring, the spring is always provided with a pulling force for the inserting plates, a clamping groove is formed in the bottom surface of the connecting plate, a plurality of spherical grooves are formed in the inner wall of the top surface of the clamping groove, balls are arranged in the spherical grooves, the balls can roll in the spherical grooves, and a fixed base is fixedly arranged on the top surface of the fixed plate. When the photodynamic therapeutic apparatus is not used, the connecting plate can be attached to the side face of the fixed plate under the action of the spring tightening force, and meanwhile, the telescopic rod is adjusted to a horizontal state, the movable end of the telescopic rod is retracted into the fixed end, so that the treatment plate reaches the horizontal state and is attached to the fixed end of the telescopic rod, the size of the photodynamic therapeutic apparatus can be reduced, and the occupied space during storage can be reduced.