A computer housing includes a front plate, a front panel and a fixing mechanism for the front panel. The front plate has at least two holes. The front panel has at least two engaging slots corresponding to the holes. The fixing mechanism includes two hooking plates and at least two springs. The hooking plates are slidably disposed on an inner side of the front plate. Each of the hooking plates has at least one hook passing through the hole to limit the hooking plate slidably between a first position and a second position. The spring connects the hooking plate and the front plate. The elasticity of the spring enforces the hooking plate and the hook abuts one edge of the hole to maintain the hooking plate on the first position.