The invention provides a household multimedia gateway system based on the DTV-VLC key technology, and the system comprises a terrestrial digital information standard receiver which is used for receiving a DTMB (Digital Terrestrial Multimedia Broadcasting) signal emitted by an outdoor radio broadcasting base station or a DVB-C (digital video broadcasting) signal connected through a wired cable. The terrestrial digital information standard receiver is integrated with a DTMB / DVB-C demodulation unit and a PLC adaptive unit, and is used for receiving an home-entry DVB-C signal, carrying out the demodulation and decoding of the home-entry DVB-C signal, restoring a digital television video code stream, and modulating the digital television video code stream into a TDS-OFDM signal. The terrestrial digital information standard receiver comprises a tuner, a local oscillator drive analog-digital converter, an automatic gain control unit for the statistics of energy of received signals, an interpolation filtering unit, a channel equalizer, and a Hibert filter. The system effectively reduces the actual engineering implementation software and hardware complexity of a DTV-VLC integration broadcast system, improves the transmission efficiency, reduces the processing time delay, simplifies the production process of multimedia gateway equipment, and reduces the production cost.