A method of manufacturing see-through thin film solar cells includes the steps of: placing a patterned photo mask above a first substrate which has a photoelectric conversion film formed on the surface thereof; and ablating the photoelectric conversion film via a laser beam passing through the patterned photo mask to form at least one hollow-out zone with different transmittance. By incorporating the laser beam with the photo mask in the manufacturing process, the problem of shortened laser lifespan caused by frequent switching of the laser for ablating patterns that occurs to the conventional technique can be resolved. Through controlling the thickness of the patterned photo mask, grey scale patterns can be displayed and resolution thereof can also be increased, thereby improve the added value of the thin film solar cells.