Successful placental development and pregnancy rely on effective extravillous trophoblast (EVT) invasion. The mechanisms underlying inadequate EVT invasion in recurrent spontaneous abortion (RSA) remain unclear. WAS/WASL interacting protein family member 1 (WIPF1), the key regulator of cytoskeletal dynamics, is exclusively expressed in first-trimester placental EVTs. Knockdown experiments revealed WIPF1's crucial involvement in successful placental development; reduced levels impaired cell migration, while overexpression induced the opposite effects. Moreover, WIPF1 knockdown in hTSC-derived EVTs hampered trophoblast differentiation. WIPF1 interacted with ACTN4 to regulate podosome formation, matrix degradation, and actin polymerization, potentially mediated by its ARG54 site. Notably, WIPF1 was significantly down-regulated in human RSA patient EVTs and RSA mice trophoblast giant cells (CBA/J × DBA/2). This association suggests WIPF1 as a potential key player in RSA pathogenesis. In conclusion, our study spotlights WIPF1 as a pivotal factor in EVT invasion, emphasizing its multifaceted roles and implications in pregnancy complications like RSA.