Abstract: In order to study the mechanical characteristics of reinforced composite pipe wound with steel strip for marine oil and gas transportation under complex loads, a numerical calculation model that considers non-linear contact was established. The model was studied to reflect the deformation and load-bearing properties of the composite pipe wound with steel strip under the combination of internal and external pressure, bending and tensile loads. The results show that the greater the pressure difference (the external pressure is greater than the internal one and ≤2 MPa), the more flexible the reinforced composite pipe wound with steel strip. Compared with pure bending, the additional combined effect of tensile load and pressure difference reduces the flexibility of reinforced composite pipe wound with steel strip. Compared with pure stretching, the additional combined effect of bending load and differential pressure reduces the tensile load carrying capacity of the reinforced composite pipe wound with steel strip. Compared with a single load, the location of the high stress area of the inner and outer polyethylene (PE) pipes and the symmetrical stress distribution path of the inner strip change under the complex loads. The greater the spiral angle and friction coefficient of the strip, the lower the flexibility of reinforced composite pipe wound with steel strip. The greater the friction coefficient, the higher the bearing capacity of reinforced composite pipe wound with steel strip. With the increase of the spiral angle under the combined bending load, the critical bending moment during buckling is non-monotonic and has a maximum value. The results can provide theoretical basis for the design, manufacture, and safety evaluation of reinforced composite pipe wound with steel strip.