The invention provides a method for testing energy consumption of a new energy plug-in hybrid vehicle. The method comprises the following steps: S1, performing a transient operation characteristic test for each road condition by performing a power maintenance test and a full power test in a test environment; S2, performing a temperature test through an environmental chamber during the test, respectively testing the time, the speed and the mileage according to a four-wheel drive drum, and obtaining the engine speed and the battery assembly work data through a CAN bus; S3, dividing the transition energy consumption test by state boundary points after summarizing the data in the S2; and S4, after the transition energy consumption test is divided, forming the energy consumption weighting in two stages, and performing the weighting work of the energy consumption cycle test according to the energy consumption value obtained in the S2 to form an energy consumption test indicator for new energy vehicles.