The utility model discloses a wireless inspection device of insulating oil of oil -immersed transformer, moisture data acquisition stiff end including connecting the gas content data acquisition stiff end on oil -immersed transformer's first fuel outlet valve, on the second fuel outlet valve to reach the data receive mobile terminals who constitutes by data receiving unit, data processing unit, data memory cell and data display unit, the gas content data acquisition stiff end gathers the appearance by the dissolved gas who has the serial data interface and a radio data transmission means forms, moisture data acquisition stiff end gathers the appearance by the moisture that has the serial data interface and the 2nd radio data transmission means forms, data receiving unit passes through a wireless network and a radio data transmission means and the 2nd radio data transmission means communication and receives data, after the data processing unit carries out data processing, sends into data memory cell and stores to demonstrate through data display unit.