The present invention discloses a lithium battery control method of an electric vehicle. Four wheels of the electric vehicle are provided with a left front wheel pressure sensor, a right front wheel pressure sensor, a left rear wheel pressure sensor and a right rear wheel pressure sensor. The method comprises the steps: a lithium battery controller receiving the current pressure value of the left front wheel pressure sensor, the current pressure value of the right front wheel pressure sensor, the current pressure value of the left rear wheel pressure sensor and the current pressure value of the right rear wheel pressure sensor; selecting one tire or two tires corresponding to the minimum pressure value from the current pressure values, and identifying the selected tire or tires as the current electric drive tire or tires; and performing power supply driving on drive devices for the current power supply tires according to drive devices of the current identified drive tires. Therefore the effectiveness of driving is improved and the waste of excess energy is reduced. A reasonable allocation of the power supply of the electric vehicle is made.