The invention discloses an amplifying and filtering circuit-based household gas intelligent monitoring system. The amplifying and filtering circuit-based household gas intelligent monitoring system includes a mobile terminal, a server terminal, and a gas flow detecting terminal; wherein the gas flow detecting terminal is connected to the server terminal, and the server terminal is connected to the mobile terminal; the server terminal includes a main controller module, a first data transmission module, a data storage module, a clock module, a keyboard input module, and a touch display screen, wherein the first data transmission module, the data storage module, the clock module, the keyboard input module, and the touch display screen are connected to the main controller module; the gas flow detecting terminal includes a second data transmission module, a microcontroller module, a flow sensor, an analog-to-digital conversion circuit, an amplifying and filtering circuit, and a detecting and rectifying circuit, wherein the flow sensor is connected to the microcontroller module by the analog-to-digital conversion circuit, the amplifying and filtering circuit, and the detecting and rectifying circuit which are successively connected, and the second data transmission module and a second display module are connected to the microcontroller module.