Power supply capacity discrimination method of charging equipment

The invention relates to a power supply capacity discrimination method of charging equipment, comprising the following steps: charged equipment is connected with charging equipment through a connection interface; a power supply discrimination controller discriminates whether a positive data pin and a negative data pin of the connection interface are high impedance; if yes, the charging equipment has first power supply capacity; if no, whether the positive and negative data pins are short-circuited is discriminated; if short-circuited, whether the positive and negative data pins are first voltage is discriminated; if the positive and negative data pins are the first voltage, the charging equipment has third power supply capacity; if the positive and negative data pins are not the first voltage, whether the positive and negative data pins are second voltage and third voltage is discriminated; and if the positive and negative data pins are respectively the second voltage and the third voltage, the charging equip