A stabilizing apparatus for preventing a server cabinet from moving, includes two mounting members oppositely mounted to the server cabinet, two support members slidably mounted to the mounting members respectively, an operating member, and two locating assemblies. Each locating assembly is mounted to a corresponding support member, the operating member, and a corresponding mounting member respectively. The operating member moves down to drive the corresponding locating assemblies respectively to move the corresponding support members down, until the support members stand on a supporting plane.