The invention discloses a method for obtaining a gap discharge voltage bearing rate of an EGLA. The method comprises the following steps of firstly performing overall modeling on the EGLA and a test environment by utilizing finite element calculation software, and calculating equivalent capacitance of an EGLA body and a gap under a test voltage waveform, thereby obtaining a theoretical gap discharge voltage bearing rate gamma 1 of the EGLA; and secondly according to national standards, performing discharge testing on the EGLA, connecting the whole EGLA to a test loop for measuring a 50% discharge voltage VE of an overall discharge voltage at first, then enabling the EGLA body to be short-circuited, only reserving an air gap, performing discharge testing on the air gap according to the sameprocess, and measuring a discharge voltage Vg of the air gap, thereby obtaining an actually measured gap discharge voltage bearing rate gamma 2 of the EGLA, wherein in an acceptable error range, thegap discharge voltage bearing rate of the EGLA can be considered to be gamma 2. The method has engineering practical values for EGLA structure design, reasonable configuration of body parameters and optimization of insulation coordination of the EGLA and a power transmission line, and is simple in operation, convenient and high in accuracy.