The utility model discloses an auxiliary device for automobile detection equipment in the field of automobile industry, namely, a wheel restraining device for automobile bench braking force detection, and aims to solve the problem that a detected automobile is in an unstable state in existing automobile bench braking force detection so as to cause large error in braking force detection. The device is composed of a restraining roller mechanism, a lifting hydraulic system and a positioning hydraulic system. A horizontally-forward restraining force is applied on a tested wheel through the restraining roller so as to keep a tested automobile in a stable state; and the lifting hydraulic system and the positioning hydraulic system are connected in a herringbone shape through a connecting arm, which enables the restraining roller to freely move in a two-dimensional plane.