In terms of constraint conditions and force characteristics, the connection characteristics of prefabricated double-pile caps and pile foundations are different from those of traditional cast-in-situ pile caps.This paper adopts finite element analysis to compare prefabricated double-pile cap joints and traditional cast-in-situ double-pile cap joints.It also analyzes their differences in structural internal force, concrete stress, structural deformation, and force distribution and summarizes general rules.The results show that the connection between the pile foundation and the prefabricated double-pile cap can be regarded as a solid joint；the concrete in the prefabricated double-pile cap joint will not be destroyed before the pile foundation.The bending moment above the pile body of the prefabricated double-pile cap joint is larger than that of the traditional cast-in-situ pile cap joint, so the bending resistance above the pile top should be calculated.