A semiconductor structure includes a substrate, a gate dielectric layer and a conductive layer that are stacked, and the gate dielectric layer is located between the substrate and the conductive layer. The substrate includes a semiconductor substrate and an insulating substrate which are arranged on the same layer. The conductive layer includes: a gate conductor layer, a projection of which on the substrate covers the semiconductor substrate, and an external connecting layer, a projection of which on the substrate covers the insulating substrate. A groove is formed on a bottom surface, towards the substrate, of the external connecting layer and the groove is filled with an insulator.