The invention discloses an Internet of Things system based on a wireless network, comprising a frequency selective receiving circuit, a feedback adjusting circuit and a compensation output circuit, wherein the frequency selective receiving circuit suppresses the instantaneous pulse signal by a transient suppression circuit composed of an inductor L1, a transient suppression diode D1 and diodes D2and D3 to prevent the instantaneous pulse signal from damaging the circuit. The feedback adjustment circuit receives the signal of the frequency selective receiving circuit, the transistors Q2, Q3 andthe slide rheostat RW1 are used to form a composite circuit amplitude modulation, the transistor Q5 is simultaneously designed to feed back the regulation signal for further amplitude modulation, thecompensation output circuit finally uses the power supply +10V to provide the base potential for the collector of the transistor Q4 in the feedback adjustment circuit, and the power supply +10V provides the base potential for the inverting input terminal and the output terminal of the comparator AR3, thereby effectively stabilizing the signal of the signal transmission channel in the Internet ofThings system based on the wireless network, and automatically adjusting the signals to filter out the abnormal signal at the same time.