The invention discloses an intelligent household information system of an internet of things, which comprises a terminal device system, a secure transmission system, an information management system and an application system; the terminal device system consists of a hardware sub-platform, a system and software sub-platform, an internet of things sub-platform, a 3G sub-platform and an input and output sub-platform, and the system adopts delicate intelligent design, comprises an industrial automation technology, an intelligent technology and a network communication technology and realizes the fusion of two nets; and the sub-platform of the internet of things consists of infrared, Bluetooth, RFID, RS232, RS485, RJ45, USB, DB9, a DB25 common serial interface, a parallel interface, other interfaces and an SAM secure access module. The system does not need message sending or phone activation, realizes complete combination of security defense and household management, overcomes the problems of communication time delay, image effects, unitary instructions and functional defects, has low purchase, maintenance and working cost and truly realizes intelligent active household management.