The present invention discloses a design method for a low power consumption Internet of things wireless sensor node, comprising a hardware part and a software part. The hardware part comprises an MCU, a radio frequency chip, an RTC chip and a data transmission interface. The software part comprises a hardware driver and a basic network protocol. The software part further comprises a function module, wherein the function module comprises a period configuration module, a multi-clock dynamic switching configuration module, an event structure and management queue, a process structure and management queue. The design method provided by the present invention is capable of flexibly configuring an energy consumption level and quickly processing burst events, and can adapt to multi-task conversion processing. Module functions are encapsulated, thereby facilitating extension and modification of functions.