The invention relates to a biphase outer cam shockwave double-roller-block automobile differential, belonging to the technical field of mechanical transmission. According to the novel automobile differential, a bevel gear is arranged outside an outer gear inner retainer, and the inside is provided with a sleeve structure; power is input from the bevel gear outside the outer gear inner retainer, and transferred to double-roller blocks via the sleeve structure of the outer gear inner retainer; and the power is transferred by the double-roller blocks to a left half axle biphase outer cam connected to a left automobile wheel and a right half axle center wheel connected to a right automobile wheel, thereby implementing differential on the left and right automobile wheels. The automobile differential omits the planetary gear system in the traditional automobile differential, and the double-roller blocks respectively form multitooth meshing with the outer gear inner retainer, left half axle biphase outer cam and right half axle center wheel, and forms pure rolling meshing with the outer gear inner retainer; and thus, the differential has the advantages of compact structure, small size, light weight, high overlap ratio, high carrying capacity and high transmission efficiency, and can be widely used in various wheeled vehicles in need of differentials, such as automobiles, engineering vehicles and the like.