A typical capsule endoscope consists of seven parts, a transparent housing, a light source, an imaging element, a sensor, a battery, a transmitter module and an antenna. The circuit system in turn contains sensor detection parts, signal processing parts and wireless transmission parts. The sensor detection components such as image, temperature, pH detect information in the digestive tract, which is processed by the signal processing component and sent to the extracorporeal via the wireless transmitter component. The in vitro receiver receives the signal, which is processed by the in vitro processing unit and displayed at the terminal. In addition, with the need for function expansion, capsule endoscopes can also contain drug release components, mechanical components for microsurgery. At present, most of the capsule only integrates one or more of a small number of functions.