NOVELTY - A chalcogenide film preparing method involves mixing copper-zinc-tin containing solution and sulfur containing solution for forming a copper-zinc tin sulfur sol precursor. Copper-tin-containing solution and the sulfur containing solution are mixed for forming a copper tin sulfur sol precursor. The copper-tin-containing solution and the sulfur and selenium containing solution are mixed for forming a copper-tin sulfur selenium sol precursor. The copper-zinc tin sulfur sol precursor, copper tin sulfide sol precursor and the copper-tin sulfur selenium sol are spin coated, dried and annealed.    USE - Method for preparing a chalcogenide film that is utilized for semiconductor devices such as solar cells.    DETAILED DESCRIPTION - A chalcogenide film preparing method involves adding 0.7-0.12 mole/l metal copper acetate, 0.03-0.07 mole/l stannous chloride and 0.03-0.08 mole/l zinc acetate to ethanolamine solvent, stirring until completely dissolved and forming a copper-zinc-tin containing solution. 0.7-0.12 mole/l metal copper acetate and 0.03-0.07 mole/l stannous chloride are added to ethanolamine and stirred until to completely dissolve in the solvent to form a copper-tin-containing solution. 0.2-1.5 mole/l thioacetamide is added to ethanolamine and stirred until to completely dissolve for forming a solution containing sulfur. 0.2-1.5 mole/l thioacetamide and 0.2-1.5 mole/l selenium powder are added to ethanolamine, and stirred until completely dissolved for forming a solution containing sulfur and selenium. The copper-zinc-tin containing solution and the sulfur containing solution are uniformly mixed for forming a copper-zinc tin sulfur sol precursor. The copper-tin-containing solution and the sulfur containing solution are uniformly mixed for forming a copper tin sulfur sol precursor. The copper-tin-containing solution and the solution containing sulfur and selenium are uniformly mixed for forming a copper-tin sulfur selenium sol precursor. The copper-zinc tin sulfur sol precursor, copper tin sulfide sol precursor and the copper-tin sulfur selenium sol precursor are spin coated and dried in a vacuum oven. The spin-coated samples are placed in a tube furnace under a nitrogen atmosphere and annealed at 300-550 degrees C for 10-90 minutes to obtain the finished product.