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With the daily worsening of global energy crisis and environmental pollution, characteristics of the non-pollution, non-noise and non-raw material except the sun of photovoltaic generation makes it a promising green energy. At present, the maximum output power of photovoltaic battery changes with the external changing environment, and it plays the match role in internal resistance and external load impedance of photovoltaic battery. A photovoltaic charger based on MPPT is designed in this paper, and the design of special photovoltaic charging inverter, problems of charging batteries and other issues are discussed. Asymmetric fuzzy control is applied to the maximum power point tracking control of photovoltaic charger, which can guarantee the maximum power point tracks photovoltaic battery quickly when the external environment changes dramatically, and has high control precision and stability. Finally, it is proved that the efficiency of the photovoltaic charger is relatively high.