The fracturing process of fracture network in shale is accompanied by a complicated fluid-solid-thermo-chemical coupling mechanism between fracturing fluid and rock. To evaluate the fracture propagation under this coupling mechanism，we performed the hydraulic fracturing experiments with fluid-solid-thermo-chemical coupling and highlighted the effects of thermal processes and hydration on shale fracture propagation. The research results show that the high temperature shale cooled by fracturing fluid is subject to thermal fractures during fracturing，resulting in micro-fractures and thus reducing the tensile strength. At the same time，the brittleness of the rock intensifies，which is conducive to the formation of a fracture network. In addition，the hydration stress is induced by hydration，causing stress concentration at the fracture tip and increasing the stress intensity factor. Meanwhile，the intrusion of the fracturing fluid reduces the weak plane cohesion and the critical stress intensity factor. The fractures are easy to propagate or turn along the weak plane，facilitating the formation of the fracture network.