The invention discloses a novel large-speed-ratio hypoid gear which comprises a driving gear and a driven gear which are matched eccentrically. The driving gear is a spiral cone gear, the driven gear is a spiral bevel gear, a gear rod portion of the driving gear is provided with an annularly distributed gear groove, the inner diameter of the driven gear is 180 mm, the outer diameter of the driven gear is 320 mm, and the distance between the gear surface cone center of the spiral cone gear and the rear end face of the gear surface is 160 mm. The transmission ratio of the novel large-speed-ratio hypoid gear is 8.17, and the largest outer diameter of the driven gear is only phi 320. By means of optimization of a gear root portion R angle, modulus optimization and improvement of gear thermal treatment, gear surface spraying and other technologies, the hypoid gear is obtained through calculation, the largest output torque of the driven gear is larger than 11000N.m, and performance requirements of clients for a finished vehicle are met.