The invention provides a phase sequence identification method during charging of an electric automobile. The method comprises the following steps of: inserting a charging gun into a charging socket of the electric automobile, wherein the charging gun is connected with an external power supply; after determining that the charging gun is connected with the charging socket, acquiring effective values of a first phase voltage, a second phase voltage and a third phase voltage which are input by the charging socket; when the external power supply is judged to be a three-phase power supply according to the effective values of the first phase voltage, the second phase voltage and the third phase voltage, acquiring a rising edge zero point of any phase voltage of the first phase voltage, the second phase voltage and the third phase voltage, and detecting transient values of other two of the first phase voltage, the second phase voltage and the third phase voltage; and judging a phase sequence of the external power supply according to the transient values of the other two of the first phase voltage, the second phase voltage and the third phase voltage. By the phase sequence identification method, the type of the external power supply can be automatically identified; charging of different types of power supplies is realized by selecting different control strategies, so that the cost of constructing a hardware circuit is saved; and therefore, the compatibility and the reliability of a charging system are improved. The invention also provides a phase sequence identification device during charging of the electric automobile.