The present invention relates to the field of electrical technology, and more particularly, to a method and system for field testing for no-load and load loss of an on-vehicle power transformer, the field test method comprising field testing of no-load and load loss of an on-vehicle power transformer use the system; the field test system includes a test system and an open-wing deployable teapot, wherein the test system is located within the open-winged deployable tearoom; The test system includes a test connection terminal for connecting the transformer under test, a power supply for providing a test voltage to the transformer under test, a measuring instrument for acquiring the transformer under test measurement data, and a measurement control device for controlling the measuring instrument includes; the power supply device, the measuring instrument and the measuring control device are all located in the test circuit where the test connection terminal is located; It is connected to the input terminal of the power supply and the power supply of the test site. The present invention can perform a complete field test for no-load and no-load of large power transformers.
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