The invention discloses a method and system for remotely controlling a vehicle. In a communication control process of a mobile terminal and a vehicular-mounted equipment end, a rolling code type method is employed, i.e., multiple groups of ciphers and multiple encryption and decryption algorithms are simultaneously replaced uninterruptedly, so that decoding caused by interception of information by a decoder in the communication process is prevented, the data security when the mobile terminal and the vehicular-mounted equipment end communicate is guaranteed, the security factor is improved, and the method has the advantages of high simplicity, convenient operation, reasonable design, convenient application and the like.