This paper mainly introduces a pure hardware design of a solar charging circuit based on CN3065 chip,us-ing DC-DC 5V boost circuit to achieve the charging function for mobile phones.The design was experimentally tested un-der 9000lux solar irradiance,and achieved stable current,voltage,and power values.Compared with other solar charging solutions,this circuit has the advantages of simple design,low cost,and good stability.Therefore,this design provides ref-erence value for the practical application of solar charging circuits.