<p>Earthquake disasters frequently trigger a series of aftershocks, which inevitably cause additional damage to the soil. This study conducted cyclic simple shear tests to examine the dynamic properties of soft clay subjected to the mainshock–aftershock sequence loading. The coupling effect of maximum earthquake acceleration and intervals between seismic events on the cyclic shear behaviors of soft clay was analyzed utilizing equivalent cyclic shear loading and reconsolidation degree. The research results suggested that the successive action of aftershock loads led to additional deterioration of the mechanical properties of soft clay. This was manifested as the continuous accumulation of cyclic pore pressure and the significant degradation of dynamic shear modulus. During the loading intermittency, the reconsolidation process allowed the soil to drain and become denser. This effectively limited the growth of cyclic shear strain and the reduction of effective stress in subsequent loading stages. Besides, several empirical models for predicting the dynamic shear modulus and degradation parameter were proposed based on the earthquake acceleration and reconsolidation degree. It was found that when the amplitude of cyclic loading was small, the increase in reconsolidation degree promoted the degradation of stiffness. However, as the stress amplitude increased, the suppressive impact of reconsolidation on the softening rate progressively became apparent. The findings contribute to a better understanding of the dynamic behaviors of the soft clay under sequential earthquake action.</p>