The utility model discloses a test device of simulation electric power system short -circuit fault electric current. Wherein, the device includes: input module for the receipt needs the fault current's of simulation information, control module is connected with input module, capture card, programme -controlled direct current source, the capture card is connected with control module and power amplifier, power amplifier, with the capture card and etc. The ampere -turn be connected for to waiting ampere -turn output interflow decay current signal, programme -controlled direct current source is connected with waiting ampere -turn for to waiting ampere -turn output direct current decay current signal, when the ampere -turn, be connected with power amplifier, programme -controlled direct current source, current transformer homogeneous phase for receive to exchange decay current signal and direct current decay current signal, and will exchange the decay current signal and direct current decay current signal is applyed among the current transformer. The utility model provides an use the direct method to carry out current transformer's the big technical problem of short -circuit test calorific capacity among the prior art.