The invention discloses a method for treating the gasified and high-concentration phenol-containing organic wastewater of a fixed bed and belongs to the harmless treatment on the high-concentration phenol-containing organic wastewater and other high-concentration organic wastewaters during the coal chemical process. The gasified raw material of the fixed bed is crushed and ground with coal to prepare 200-mesh adsorbent coal powders with the content percentage thereof to be 80%. The pH value of the wastewater is adjusted to 2-4 by means of an acid solution. The acidic wastewater and coal powders are mixed and stirred to obtain a coal-water mixed liquor. The above coal-water mixed liquor is fed into a filter press to obtain a filtrate and dewatered coal cakes. The dewatered coal cakes are conveyed to the boiler of the fixed bed, so that the high-concentration phenol-containing organic wastewater cracks and burns during the cracking reaction in the boiler. The filtered and pressed filtrate is introduced into a subsequent biochemical system. Through the above process, the removal rate of phenolic organic compounds is up to 60-70%, and the B/C value (biodegradability) thereof is increased to 0.3-0.4. The gasified raw material of the fixed bed is crushed and ground with coal, and then the high-concentration phenol-containing organic wastewater and coal powders are mixed to burn. In this way, the green and harmless treatment is realized.