Preparation method of solar cell

The invention provides a preparation method of a solar cell. The method comprises the steps: providing a shielding and supporting strip; providing a substrate device, wherein the substrate device comprises a device region and a scribing region, and the substrate device comprises a semiconductor substrate layer and a first doped semiconductor layer located on one side of the semiconductor substrate layer; arranging the substrate device above the shielding supporting strip, wherein the shielding supporting strip is in contact with the first doped semiconductor layer of the scribing area, and the surface of the first doped semiconductor layer of the device area is exposed; forming a first transparent conductive film on the surface of the first doped semiconductor layer in the device region through a coating process by taking the shielding and supporting strip as a mask; after the first transparent conductive film is formed, scribing the substrate device along the scribing area, wherein the width of the shielding