NOVELTY - A polycyclohexene phosphonate composite film preparation method involves preparing and reacting solution for 5 hours. Ammonium persulphate is added to the solution. The solution is decompressed and distilled for removing solvent to obtain cyclohexene acid product C. The poly cyclohexene phosphonic acid and alkaline polymer are dissolved in methyl pyrrolidone solvent. A glass slot in a blast drying box is heated at 50 degrees C and maintained for 24 hours to remove solvent. The glass slot is cooled to room temperature. The film is peeled off. The glass slot is soaked in de-ionized water.    USE - Method for preparing a polycyclohexene phosphonate composite film.    ADVANTAGE - The method enables increasing proton conductivity of a composite film.    DETAILED DESCRIPTION - A polycyclohexene phosphonate composite film preparation method involves adding equal mol quantity of cyclohexanone and phosphorus trichloride in a three-necked bottle under protection of nitrogen. The mixture is condensed, refluxed, and stirred at room temperature for 24 hours. Reaction solution is added slowly to acetic acid 8-10 times by a constant pressure drop funnel and reacted for 24 hours. Hydrogen chloride gas is absorbed by sodium hydroxide solution during reaction process. A circulating water pump and a condensate reflux device are utilized for heating the obtained solution for 2-3 hours at 70 degrees C. The solution is distilled at 100 degrees C for 0.5-1 hours by a vacuum distillation unit. Volatile solvent in the solution is removed at 140 degrees C for 0.5-1 hours. A mechanical pump is utilized during vacuumizing process. Temperature of the product is raised to 170 degrees C for 1 hours. The product is cooled to room temperature to obtain cyclohexene acid B monomer. Ring alkene hexyl phosphonic acid monomer, cyclohexene acid monomer, 0.1% mol ratio of azodiisobutyronitrile and 1.5 mol/L of dimethyl formamide or anhydrous methanol are added in solvent at 65-70 degrees C under the protection of nitrogen. The obtained solution is reacted for 5 hours. 2.5% mol ratio of ammonium persulphate is added to the solution at 65-70 degrees C under the protection of nitrogen and reacted for 24 hours. The solution is decompressed and distilled for removing solvent to obtain cyclohexene acid product C at 110 degrees C, where mol ratio of the acid and alkali polymer 5:1-1:1. Poly cyclohexene ring phosphonic acid for preparing a composite film. The poly cyclohexene phosphonic acid and alkaline polymer are dissolved in methyl pyrrolidone solvent, and uniformly stirred. A glass slot in a blast drying box is heated at 50 degrees C and maintained for 24 hours to remove solvent. The glass slot is cooled to room temperature. The film is peeled off. The glass slot is soaked in de-ionized water.