In order to study the stability of GFRP lined recycled composite pipe under bending moment, a finite element analysis software was used to establish the finite element model of GFRP lined recycled composite pipe based on the bilinear constitutive relationship between layers, and the influences of the corrosion degree of outer pipe and the thickness of inner layer on the stability of GFRP lined composite pipes was analyzed. The stress cloud diagram of the composite pipe under bending action was obtained and the curve of bending moment-center point displacement of the pipe was extracted. The results show that the interlayer force between the outer pipe wall and the GFRP lining layer limits the rapid development of pipeline deformation to a certain extent, and improves the ultimate bending moment of the composite pipe and the anti-deformation ability of the pipe before buckling. The deformation and stress of the composite pipe with corrosion pit are mainly concentrated around the deepest part of the corrosion pit. With the increase of corrosion depth, the extreme value of bending moment gradually decreases.