The invention discloses an intelligent remote control key entry method and a device of an automobile. The device comprises an automobile key transmitting part and an automobile key receiving part, the automobile key transmitting part combines the a transmitting frequency band, transmitting power and transmission coding data into radio-frequency signals numbering N of different frequency bands, and a power amplifier and a radio-frequency antenna are used for transmitting the radio-frequency signals; the receiving part receives data transmitted by the automobile key transmitting part; after receiving frequency is determined, whether the receiving frequency is effective data is judged, interference information data is filtered, and information data conforming to requirements is stored in an FIFO memory; and data is decryption and matching operation are carried out on the data, then an automobile door is opened/ closed according to the information code content. The invention adopts microprocessor control, digital phase-locked frequency selection and a multiband communication technology, solves the problem of signal interference caused by communication at single frequency band in the common PKE system by utilizing multiband radio-frequency signal reorganization and a data frame structure format so as to avoid the interference phenomena among multiple keys of the same automobile type. The invention has the characteristics of simple structure, small volume, low power consumption, high sensitivity and the like.