The utility model discloses an expressway prefabricated small box girder prestress tension protective frame. The integral structure of the expressway prefabricated small box girder prestress tension protective frame is a movable frame, two parallel first I-beams are mounted on a top frame of the frame, two parallel second I-beams are perpendicular to the first I-beams, the second I-beams are slidably mounted on the first I-beams through a wheel set, a chain block is slidably mounted on each second I-beam, and the lower end of a steel chain of each chain block lifts up a tensioning jack. A clamping groove is formed in the back face of the frame, a strip wood block is mounted in the clamping groove, and the stack height of the wood block is larger than that of a small box girder. The expressway prefabricated small box girder prestress tension protective frame has smaller size; when steel strands break, the shock hazards of the steel strands can be reduced well, the height of the tensioning jacks can be adjusted through the chain blocks, and the expressway prefabricated small box girder prestress tension protective frame is suitable for tensioning work of all parts of the small box girder.