The incidence and detection rate of caesarean scar pregnancy (CSP) after caesarean section have been increasing year by year with the second child policy, advances in imaging diagnostic techniques and the persistently high rate of caesarean section in China. CSP can lead to a series of serious complications that even endanger the lives of pregnant women. Accurate diagnosis and timely treatment will effectively reduce the incidence of complications, save the lives of pregnant women, and preserve female fertility. Magnetic resonance imaging (MRI) has many advantages in the diagnosis of CSP. It can not only achieve accurate diagnosis, but also guide clinical treatment by MRI classification. This article reviews the MRI diagnostic value and research progress of CSP.