The invention belongs to the technical field of building structure engineering, and particularly relates to a connection joint for an existing concrete column and added steel beams. The connection joint comprises the existing concrete column, a steel plate enclosure and the added steel beams. The existing concrete column is sleeved with the steel plate enclosure which is fixed to the existing concrete column through high-strength screws; a structural adhesive layer is poured between the existing concrete column and the steel plate enclosure; the cross section of the steel plate enclosure is in the shape of a square, and the added steel beams are welded to four sides of the steel plate enclosure respectively. The connection joint for the existing concrete column and the added steel beams has the advantage of solving the problem about connection between the added steel beams and the existing concrete column, also has the advantages of good integrity, high earthquake-resistant performance, convenience in field construction and low cost, and accords with the design concept of strengthening the joint prior to the members.