Aiming at the cutter head thermal damage and other failure problems caused by shield cutter head mud formation in residue and clay soil,the problem of thermal-stress coupling of shield cutter head under the effect of mud in the tunnelling process is studied,and the cutter head temperature and thermal-stress distribution of coupling fields under mud effect are acquired. A shield cutter head three-dimensional finite element model is built by using software ANSYS and Solidworks. The results shows that when the mud is formed,the temperature rises sharply in a short time,which leads to a rapid increase of thermal stress to 168.2 MPa,at the same time,the maximum thermal deformation reaches 3.1 mm,then the center of cutter head is wrapped.