The invention relates to a charging method for a lithium-ion battery. The method comprises the steps as follows: a first stage comprises a plurality of accelerating charge cycles which correspond to set charging currents which increase gradually; and a second stage comprises a plurality of decelerating charge cycles which correspond to the set charging currents which decrease gradually. According to the charging method for the lithium-ion battery, on one hand, irreversible side reactions of electrolyte decomposition and the like caused by a temperature rise of polarization in a high-rate fast charge process under a high-temperature condition can be avoided; and on the other hand, charging can be achieved under an extreme low-temperature condition without additional heating and the hidden danger of lithium precipitation of a pole piece caused by the polarization is reduced, so that the service lifetime of the battery is prolonged.