The application discloses a tapered roller loading device. The tapered roller loading device comprises a box, a first backing plate, a second backing plate and a rotating part, the box is internally provided with a placing cavity, the placing cavity is suitable for placing a tapered roller, a through hole is formed in the side wall of the box and is communicated with the placing cavity, the first backing plate is arranged at the bottom of the placing cavity, the upper surface of the first backing plate is provided with a first inclined surface, the first inclined surface is suitable for abutting against the bottom of the tapered roller, the second backing plate is arranged at the top of the placing cavity and is oppositely arranged with the first backing plate, the second backing plate is provided with a second inclined surface, the second inclined surface is suitable for abutting against the top of the tapered roller, the rotating part is provided with a driving end and a connecting end, the driving end is arranged outside the box, the connecting end penetrates into the placing cavity from the through hole and is used for being connected with the tapered roller. The technical scheme provided by the application can effectively prevent the tapered roller from being radially deviated or axially moved during the loading process, and the stability of the loading posture is ensured.