The invention discloses a dual-frequency wireless sensor node, which comprises a data acquisition module, a data processing module, a power supply module and two wireless data transmission modules, namely a ZigBee-based short-distance wireless communication module and a remote wireless communication module using a wireless power amplifying circuit. The remote wireless communication module and the short-distance wireless communication module are respectively connected with the data processing module; the data acquisition module acquires data of ambient environment, transmits the data to the data processing module for analysis processing and selects one wireless data transmission module for remote or short-distance data transmission as required; and the power supply module supplies power to the modules. The dual-frequency wireless sensor node has the advantages of novel and reasonable design, simple and convenient use and operation and capability of effectively solving the problems of nonuniform energy consumption and bottleneck node of the conventional wireless sensor node by increasing the communication distance of the node.