The invention discloses a multimedia conference informing system which comprises a conference informing server, a network switch, a plurality of gate conference informing terminals, a wireless router, a plurality of elevator hall conference informing terminals, a short message receiving and transmitting module, and a plurality of participant cell phones. Each gate conference informing terminal is composed of a first ARM microprocessor, a first crystal oscillator circuit, a first reset circuit, a first data memory, an Ethernet interface circuit module, and a first liquid crystal display. Each elevator hall conference informing terminal is composed of a second ARM microprocessor, a second crystal oscillator circuit, a second reset circuit, a second data memory, a WIFI wireless network card, and a second liquid crystal display. The short message receiving and transmitting module comprises a short message PCI card, a 3G module, and a SIM card insertion slot, wherein the 3G module and the SIM card insertion slot are integrated into the short message PCI card. A SIM card is inserted into the SIM card insertion slot. The multimedia conference informing system has the advantages of high degree of intelligence, convenient use and operation, high informing efficiency, low cost, high reliability, strong practicability and high popularization and application value.