NOVELTY - Preparing proton conducting film fuel cell by spin-coating comprises: (a) preparing mixed powder: ball milling strontium carbonate, cerium oxide, and yttrium oxide; (b) preparing raw material powder: drying mixed powder; (c) preparing precursor powder: preserving mixed powder; (d) preparing fuel cell substrate: ball milling the precursor powder; (e) preparing electrolyte film paste: grinding the raw material powder, ethyl cellulose, and terpilenol; (f) spin coating, whirl coating, and heating the electrolyte film; and (g) preparing cathode: uniformly coating silver paste on the cell pre-form.    USE - The process is useful for preparing proton conducting film fuel cell by spin-coating (claimed).    ADVANTAGE - The conducting film is prepared on the cell substrate by spin-coating; thus, the obtained electrolyte layer is dense and non-crack in structure.    DETAILED DESCRIPTION - Preparing proton conducting film fuel cell by spin-coating comprises: (a) preparing mixed powder: ball milling strontium carbonate (SrCO3), cerium oxide (CeO2), and yttrium oxide (Y2O3) in a ball mill for 3-12 hours to obtain the mixed powder with grain size of 30-60 mu m; where the amount of SrCO3 is 45-50 g, the CeO2 is 44-52 g, and the remaining amount is for Y2O3 in each 100 g of mixed powder; (b) preparing raw material powder: drying the mixed powder obtained in (a) at 100-150 degrees C for 10-20 hours to obtain the raw material powder; (c) preparing precursor powder: preserving the mixed powder obtained in (a) at 1200-1400 degrees C, sintering for 3-10 hours to obtain the precursor powder; (d) preparing fuel cell substrate: ball milling the precursor powder obtained in (c) with nickel oxide (NiO) powder in the ball mill for 3-12 hours, adding 3-5% of polyvinyl alcohol (PVA) and uniformly stirring to obtain substrate mixed powder; placing the substrate mixed powder in a tablet machine, maintaining 100-500 MPa pressure for 1-5 minutes to obtain the fuel cell substrate; controlling the mass ratio of the precursor powder and NiO powder to be 46-57%; (e) preparing electrolyte film paste: grinding the raw material powder obtained in (b), ethyl cellulose, and terpilenol in an agate mortar for 10-30 minutes to obtain the electrolyte film paste; adding 0.1-0.2 g of ethyl cellulose and 3-4 g of terpilenol into 5 g of the raw material powder; (f) spin coating, whirl coating, and heating the electrolyte film: spin coating the electrolyte film paste in 200-1000 rotations/minute for 5-20 seconds, whirl coating in 1000-7000 r/min for 10-60 seconds and heating on a spin coating machine over the fuel cell substrate obtained in (d) at 400-600 degrees C for 1-30 minutes; sintering at 1200-1400 degrees C for 30-180 minutes to obtain cell pre-form; and (g) preparing cathode: uniformly coating silver paste on the cell pre-form obtained in (f), and preserving sintering temperature of 500-800 degrees C for 1-30 minutes to obtain strontium cerium oxide (SrCeO3)-based proton conducting film fuel cell.