The invention discloses an RTDS (real-time digital system) closed-loop testing method for energy storage variable-current controllers. The RTDS closed-loop testing method includes building a testing platform by the aid of an RTDS/RSCAD (RS computer-aided design) simulation system; carrying out closed-loop tests on an energy storage variable-current controller; outputting analog quantities required by the energy storage variable-current controller via a power amplifier according to input and output characteristics of an RTDS; inputting pulses generated by the controller to the RTDS in a digital quantity form; controlling on and off of a power switch tube of an inverter of a main circuit; monitoring the on and off of the power switch tube by the aid of computation software RSCAD; testing various properties of the energy storage variable-current controller. The RTDS closed-loop testing method is implemented by the aid of the closed-loop testing system for the energy storage variable-current controllers. The RTDS closed-loop testing method has the advantages that charge and discharge experiments are carried out on the energy storage variable-current controllers by the aid of input and output functions of the RTDS, the real-time closed-loop simulation tests are mainly carried out on the energy storage variable-current controllers during the charge and discharge experiments in a P/Q (active power/reactive power) control mode, a constant-current control mode and a V/f (voltage/frequency) control mode, and the power quality and the like of micro-grids can be improved by the aid of the energy storage variable-current controllers which are tested by the aid of the method.