The invention discloses a plastic intake pipe joint. The plastic intake pipe joint comprises an intake pipe support and a rubber pipe head fixed on the intake pipe support; the intake pipe support comprises a seat ring and a variable-diameter support part; the variable-diameter support part is fixed on the seat ring and extends toward one side of an axial direction of the seat ring; the rubber pipe head is fixed on an outer surface of the variable-diameter support part. The rubber pipe head of the plastic intake pipe joint of the present invention is fixed on the intake pipe support, and therefore, the strength of the rubber pipe head is improved, so that the stability of a connection structure between an engine intake pipe and an electronic throttle valve joint can be improved; further, the plastic intake pipe joint is good in durability; as a result, a requirement on controlling a fastening force of a clamp during assembling is reduced and the cost is saved.