The invention provides a modeling method and device for air conditioner connecting pipes. The method comprises the steps of dividing an air conditioner connecting pipe into a plurality of sections of sub-connecting pipes; performing modeling for the plurality of sections of sub-connecting pipes separately to obtain a plurality of sub-models corresponding to the multiple sub-connecting pipes in a one-to-one manner; adding analog calculation results of the sub-models for the sections of sub-connecting pipes and regarding the result as the analog result for the connecting pipe. According to the invention, error of analog simulation is reduced and the accuracy of analog simulation for connecting pipes is improved.