The invention relates to a helical-tooth-type large torque loading device, and the device comprises a flange I, a connecting shaft I, a support I, an intermediate shaft, a cylinder body, a double-head hydro-cylinder, a double-head hydro-cylinder mounting base, a support II, a connecting shaft II, a flange II, a supporting base I, a cylinder base, a supporting base II, a sliding block and a linear guideway; the connecting shaft I is connected with the support I through a bearing, the connecting shaft I is engaged with one end of the intermediate shaft in a helical tooth way, the intermediate shaft is arranged in the cylinder body, the other end of the intermediate shaft is engaged with the connecting shaft II in a helical tooth way, the double-head hydro-cylinder is fixed to the cylinder body, and two ends of the double-head hydro-cylinder are respectively and fixedly connected with the support I and the support II through bolts; according to the invention, the loading of large torque is realized by transmission of the double-head hydro-cylinder and the helical-tooth rotating oppositely, and the torque remains stable, in operation process, a program controls and changes loading, and the device has remarkable advantages of simple and compact structure, good manufacturability, convenient operation and high universality.