The invention discloses a Hall effect type automobile wheel speed detecting device with a buffer. The Hall effect type automobile wheel speed detecting device mainly comprises an L-shaped connecting rod, a coded disc mechanism assembly, a wheel speed detecting mechanism assembly, the buffer and an upper fixing mechanism assembly; the coded disc mechanism assembly on the lower portion of the wheel speed detecting device is fixedly mounted on a hub of a detected automobile I by a connecting device III, so that a coded disc and a wheel rotate synchronously; and a strong magnet in the upper fixing mechanism assembly is attracted onto an automobile body, so that the upper portion of the wheel speed detecting device is fixed. A coded disc structure with mounting holes radially arranged at unequal angles can be quickly and conveniently mounted on the hub of the automobile and is applicable to different types of automobiles with different quantities of nuts, and pulse signal testing holes which are uniformly distributed are arranged on the edge of the coded disc, so that the wheel speed is directly measured; and a vertical buffering mechanism in the device eliminates influences of vertical vibration to the wheel speed detecting device when the automobile runs, and the Hall effect type automobile wheel speed detecting device is low in cost, convenient to install and high in test precision and universality.