The invention discloses a preparation method of a catalyst for methanol electrocatalytic reforming. The method comprises the following steps: first, dissolving a certain amount of terephthalic acid (BDC) in a mixed solution with a certain proportion of ethanol, deionized water and N,N-dimethylformamide (DMF), then dissolving CuCl2.2H2O and CoCl2.6H2O in the mixed solution, adding triethylamine (TEA), carrying out stirring for a plurality of minutes, carrying out ultrasonic treatment under a sealing condition for a plurality of hours for generating a double-metal organic framework compound of copper ions, cobalt ions and the BDC, carrying out ultrasonic centrifugation for a plurality of times, carrying out drying at room temperature to obtain a sample (marked as CoCu-BDC), mixing the samplewith carbon black according to a certain proportion, adding a certain amount of Nafion solution, and carrying out ultrasonic dispersion in a mixed solution of ethanol and water, so as to obtaining catalyst slurry finally. The CoCu-BDC prepared by the method provided by the invention is dispersed in the slurry in the form of ultra-thin nanometer sheets in the catalyst, the charge conduction capability is good, and the very high methanol electrocatalytic reforming performance is achieved. In addition, the preparation method is simple and feasible, has a short preparation time, and has a good industrial application prospect.