The invention discloses a skull structure of a simulation fetus teaching aid, the skull comprises a left forebone, a right forebone, a front fontanel, a left top bone, a right top bone, a rear fontanel, an occipital bone, a left temporal bone and a right temporal bone, and the left forebone, the right forebone, the left top bone, the right top bone, the occipital bone, the left temporal bone and the righttemporal bone are skulls, made of hard materials and placed and connected according to own positions. A cranial seam is reserved at the joint of each skull; and an elastic connecting piece isarranged at the lower part in the skull seam and is respectively connected with two adjacent skull bones. The skull of the infant teaching aid is separated according to the skull part and then connected through the elastic connecting piece, the state that the head of a fetus is slightly deformed due to extrusion during delivery can be simulated, the front fontanel and the rear fontanel which are made of soft materials are clamped through the pressing pieces, meanwhile, the hood which is soft in hand feeling and obvious in partition is arranged, and the model simulation degree is improved; andthe intuitive feeling during obstetric nursing teaching can be improved.