The invention discloses a dynamic calibration method of an electric automobile lithium ion battery SOC. The method includes the following steps that an OCV-SOC list is obtained and stored through an open circuit voltage method, and vehicle standing threshold time is preset; if vehicle standing time is longer than the threshold time, the current single voltage of a vehicle is obtained, and if the vehicle standing time is shorter than or equal to the threshold time, a battery management system does not act; and the battery management system searches the OCV-SOC list according to the current single voltage for an SOC value needing to be calibrated, the current SOC value and the SOC value obtained through the search of the list are recorded, the SOC deviation between the current SOC value andthe SOC value obtained through the search of the list is calculated, and the battery management system uses an SOC algorithm with dynamic calibration for conducting dynamic calibration on the batterySOC. By the adoption of the dynamic calibration method of the SOC, the SOC deviation is recorded and not calibrated in the vehicle standing process according to the battery single voltage, a static error is complemented to the battery SOC in proportion in the vehicle operation process, the SOC jumping change caused by SOC static calibration is avoided, the client misunderstanding that large powerconsumption or electric quantity counterfeit happens in the vehicle standing process is avoided, and the method is only achieved through a software algorithm of the battery management system.