The utility model provides an unusual monitoring devices of transformer operation, includes: a load data ware, it is equipped with wireless communication module, and it all corresponds from three pressure circuit input lines in area and three current loop input lines and connects on the transformer, three alternating current measuring device connects respectively on the three phase power supply circuit of transformer, alternating current measuring device includes SOC measurement chip, and its serial ports is external respectively to have alternating current to measure simulation volume regulator circuit, button liquid crystal display circuit and zigBee wireless communication module, SOC measurement chip pass through zigBee wireless communication module with the communication of load data ware. The utility model discloses can be according to the out -of -limit characteristic of the load of transformer, the out -of -limit condition of analysis transformer realizes the unusual monitoring of transformer operation.