The invention relates to a short-circuit current calculating method and device of a double-fed blower fan in an asymmetric fault. The method comprises that aimed at the asymmetric fault, the drop degree of voltages of the three phases ABC of a stator after the fault as well as voltage and current space vectors of the stator before the fault are obtained; voltage positive and negative sequence complex vectors of the stator of the double-fed blower fan after the fault are obtained according to the drop degree and the voltage and current space vectors; a magnetic linkage of the stator of the double-fed blower fan after the fault is obtained by utilizing the voltage positive and negative sequence complex vectors of the stator after the fault and the current space vector of the stator before the fault; and the short-circuit current of the double-fed blower fan after the fault is obtained according to the magnetic linkage of the stator of the double-fed blower fan after the fault.