The invention provides a clean and environment-friendly type compound thickening agent for fracturing fluid and a preparation method. The compound thickening agent is prepared from amido hydroxyethylpolyacrylamide, vegetable gelatin, xanthan gum, fungus cellulose enzyme, ethylene diamine tetraacetic acid disodium and sodium sulfate. The clean and environment-friendly type compound thickening agent for the fracturing fluid prepared in the invention has relatively strong thickening, temperature-resistant and anti-shear ability, is good in suspended sand-carrying ability and friction-reducing performance, easy for gel breaking and flowback, high in fracturing success rate and easier to degrade after flowing back to the ground, and does not cause pollution to the environment; meanwhile, the compound thickening agent is fewer in system ingredients and configuration links and easy for controlling quality, and can be compounded when needing to be used, the prepared compound thickening agentfor the fracturing fluid is stable in performance, can maintain a liquid state with a certain viscosity for a long time, and does not generate stratification or sediment; therefore, the application fields of the compound thickening agent are expanded, and the compound thickening agent has a good industrialized application prospect and practical application value.