The invention relates to a system for realizing a network security control function based on a wireless sensor in a transformer substation, and the system comprises a wireless sensor and a wireless data collection terminal, and each of the wireless sensor and the wireless data collection terminal is both of a star network structure without a relay node. The invention also relates to a method for realizing the network security control function based on the wireless sensor in the transformer substation. By adopting the system and the method for realizing the network security control function based on the wireless sensor in the transformer substation, the characteristic of micro-power operation of the wireless sensor is fully considered, and the control management of the network security is systematically designed. The method is characterized in that secret key management is automatically generated by software based on the unique code of the MCU and can only be read by a programming tool,each sensor has an independent secret key, a secret key generator is not needed, and the method is quick, convenient, safe, low in cost and free of extra power consumption.