The invention discloses a method for preparing a compensating circuit on a mobile electronic product casing. The method mainly includes procedures of back casing forming, molybdenum film plating, molybdenum film engraving, photovoltaic conversion unit plating, PN junction engraving, transparent conduction electrode plating, transparent conduction electrode engraving and antireflection film plating, wherein back casing forming uses a traditional plastic forming method to enable an extraction electrode, a bypass diode and the casing to form a whole; molybdenum film plating mainly uses a vacuum coating method and is sputtering coating; photovoltaic conversion unit plating uses a co-evaporation method to prepare a CIGS layer, uses a water bath method to prepare a CDS layer, and uses a continuous sputtering coating method to prepare a ZNO layer; and transparent conduction electrode plating and antireflection film plating use the sputtering coating method, molybdenum film engraving uses a mechanical lining method, and procedures of photovoltaic conversion unit plating and transparent conduction electrode engraving use a laser lining method. By means of the methods, a large quantity of solar cell structures capable of compensating mobile electronic products for electric energy can be produced, and single using time of the solar cell structures can be prolonged under the condition that battery capacities are not changed.