The invention discloses a method and device obtaining power consumption of an application program in a mobile terminal. Power consumption of an application program in a mobile terminal is measured conveniently with a low cost. The method comprises steps: whether a mobile terminal can output an accurate current value is determined, if the mobile terminal can output an accurate current value, a test program carries out current sampling of a running tested application program in the mobile terminal in a preset sampling frequency, and the test program is installed and runs in the mobile terminal; according to sampling value obtained from current sampling, the test program draws a power consumption curve graph of the tested application program and the curve graph is displayed on the mobile terminal. On the one hand, during current sampling, addition of expensive apparatuses and devices is not needed, the cost is low, and operation is convenient; on the other hand, the test result is displayed on the mobile terminal in a power consumption curve graph mode, the display result is visual, checking is convenient, and the test labor cost is lowered indirectly.