The invention discloses a balance car control method and a balance car control device. The balance car control method includes acquiring movement state information of a target balance car in real time; sending the movement state information to at least one responding balance car; enabling the responding balance car to receive the movement state information of the target balance car; controlling the responding balance car to execute the actions corresponding to the target balance car according to the movement state information. The balance car control method and the balance car control device have the advantages that the problem that multiple balance cars fail to synchronize in the related technologies can be solved; a user can control other balance cars when driving one balance car and synchronize the actions of the driven balance car to the other balance cars, so that synchronization of the multiple balance cars can be achieved.