The invention specifically relates to an electromagnetic torque analysis method-based small interfering time delay stability domain construction method, by considering influence of multi-time delay caused by introduction of a wide-range damping controller on an electromagnetic torque coefficient. An electromagnetic torque coefficient calculation expression of a multi-time delay system is deduced creatively; in a wide-range damping controller constant parameter condition, a small interfering time delay stability domain expression is further obtained; and by combination with engineering practice, the construction method can be adapted to satisfy the time-delay-considered small interfering stability analysis requirement in the WAMS wide application background.