Objective At present, due to the difference in the symptoms of foot damage in diabetic patients, the design scheme for personalized diabetic foot protectors is complicated and costly to implement. In order to reduce the plantar pressure accurately, a quick and low-cost personalized diabetic foot modeling and insole design scheme is proposed. Methods The patient"s foot model was constructed by scaling model with patient"s foot feature parameters, then the finite element analysis was carried out for plantar pressure. Afterwards, by means of numerical mapping model, the elastic modulus of different areas of insole was adjusted and optimized on the basis of customized insole morphology for different patients" plantar pressure, and the personalized insole model was constructed. The designed insole model was sent to 3D printer for manufacture via FDM method and used for experimental validation. Results The related mechanical indexes of the finite element prediction of the foot model constructed by the scaling modeling method were basically close to those of the CT reconstruction model, and the maximum error was controlled within 15%; Compared with wearing a normal insole, the peak pressure of the sole was effectively reduced by about 20% after using the personalized insole. The time and economic cost of this simplified design was reduced by approximately 90%. Conclusions The design scheme of the diabetes insole shortens the design cycle, and the personalized insole can effectively and accurately reduce the sole pressure, and reduce the risk of foot ulcer, which provides a technical basis for the promotion of the personalized diabetes insole.