The invention discloses a grain storage environment parameter monitoring system based on a wireless sensor network, and relates to the technical field of grain storage monitoring. The system comprises multiple acquisition devices and a supervision device, wherein each acquisition device comprises a first hollow pipe, a telescopic pipe, a second hollow pipe, monitoring devices and a communication device; multiple monitoring devices are arranged in the first hollow pipe, and the communication device is arranged in the second hollow pipe; each monitoring device comprises a temperature humidity sensor and a GPS positioning module; the communication device comprises a single chip and a ZigBee module; the supervision device comprises a ZigBee coordinator, a controller, a wireless communication module, a wireless router and a computer; an environment parameter monitoring platform and an information push platform are embedded in the computer; and the ZigBee module in each acquisition device is electrically connected with the ZigBee coordinator. By arranging the combined device of multiple temperature humidity sensors and the GPS positioning module, the system acquires the temperature humidity data with the position information, thereby obtaining an accurate and reliable grain storage environment analysis result.