Abstract: Objective Effects of interlayer cooling and path setting on temperature and stress fields of wire and arc additive manufactured 2319 aluminium alloy thin-walled parts are investigated in this study, aiming to solve the problems of high residual stress and low forming accuracy of wire and arc additive manufactured components. Methods Firstly, a finite element model of wire and arc additive manufactured 2319 aluminium alloy thin-walled parts was established. Subsequently, influence of different forming paths and interlayer cooling settings on temperature and stress field characteristics during the deposition process was analyzed with emphasis. Finally, residual deformation of thin-walled parts under different deposition processes was compared and analyzed to provide a theoretical basis for process optimization and quality control of wire and arc additive manufacturing of 2319 aluminium alloy thin-walled parts. Results The calculation results of finite element model of ten-layer single-pass wire and arc additive manufacturing of 2319 aluminium alloy thin-walled parts show that heat accumulation degree is the highest at the closing end of arc, and introduction of interlayer cooling can effectively reduce heat accumulation, and distribution of temperature field under the reciprocating path is more uniform. Conclusion Interlayer cooling can effectively reduce heat accumulation effect and equivalent residual stress of additive parts, and reciprocating path can make the overall temperature field and stress field distribution of additive parts more symmetrical and uniform.