Data transmission method and system of Internet of Things monitoring system

The invention provides an Internet of Things monitoring system data transmission method and system, and the method comprises the steps: collecting monitoring system data which comprises video data; performing framing processing on the video data to obtain a first video frame sequence; determining a first feature component and a second feature component of a first video frame and resolution information of the first video frame according to the first video frame sequence; the first video frame is a key frame; and compressing the first feature component and the second feature component of the first video frame sequence according to a predetermined compression ratio to obtain a first coded frame sequence, determining a mapping relationship between the first coded frame sequence and the first video frame, and transmitting the first compressed video frame sequence. The key frame is compressed at the predetermined compression ratio and subsequently recovered based on the mapping relation and the feature component, s