The invention discloses a method for treating phenol-containing waste water by sawdust immobilized alcaligenes faecalis. The method has the advantages that (1) the immobilized alcaligenes faecalis is easy to culture and has the advantages of simple immobilization process, excellent catalytic degradation effect, resistance to high-concentration phenol-containing waste water with the concentration of phenol up to 3000mg.milligram<-1>, strong phenol decomposition capability and repeated use; (2) the carrier of the immobilized alcaligenes faecalis is sawdust, and modified utilization of the sawdust is realized by a chemical method, so the method improves the treatment efficiency for the phenol-containing waste water by means of microbial degradation, and has a broad development prospect; (3) the immobilized alcaligenes faecalis prepared through taking sawdust as the carrier has excellent elasticity, strong resistance to temperature and pH value, stable degradation property and long half life period; and (4) when used for treating the phenol-containing waste water, the sawdust immobilized alcaligenes faecalis has the advantages of simple process, low running cost, moderate conditions, environmental protection, uneasy loss of thalli, high concentration of microorganism inside the carrier, quick degradation speed, high degradation efficiency and no secondary pollution, and can realize continuous industrial degradation of the phenol-containing waste water at the same time.