The invention discloses a method for preparing a high-temperature superconducting gadolinium-barium-copper-oxygen thin film by utilizing a chemical solution method. The method comprises the steps of firstly preparing low-fluorine-gadolinium-barium-copper-oxygen solution which adopts gadolinium oxide or gadolinium acetate tetrahydrate, barium acetate and copper acetate as initial raw materials and adopts a complexing agent, dissolving the initial raw materials in a solvent to form fluorine-contained gadolinium-barium-copper-oxygen solution, then preparing and drying a gel thin film, and finally conducting preprocessing and final processing on the thin film to obtain the high-temperature superconducting GBCO (gadolinium-barium-copper-oxygen) thin film. According to the thin film prepared by the method provided by the invention, the surface of the thin film is smooth, and the thin film has good superconductivity, and is low in preparation cost, simple in process and easy to control; the heat treatment cycle is shortened greatly, and compared with the low-fluorine-gadolinium-barium-copper-oxygen solution prepared by other methods, the method has the advantages that the fluorine content in the low--fluorine-gadolinium-barium-copper-oxygen solution is lower, the preprocessing of the thin film can be completed by the rapid heat processing within the time not more than 2h, and the performances of the obtained thin film can realize the characteristics of high-clinical conversion temperature Tc and high-clinical current density Jc.