The invention provides a combined profile with good sealing performance. The combined profile comprises a first aluminum profile and a second aluminum profile which are mutually buckled, wherein the bottom of the first aluminum profile is provided with a first barb, a first sealing part and a first extrusion part; the side wall of the top of the first aluminum profile is provided with a first supporting frame and a second barb; the side wall of the first aluminum profile is fixedly provided with a first arch frame, both sides of the first arch frame are provided with first clamping grooves, and a third rubber pad with the inn wall abutting against the convex surface of the first arch frame is arranged between the two first clamping grooves; the side wall of the second aluminum profile is fixedly provided with a second arch frame, two sides of the second arch frame are provide with second clamping grooves, and a fourth rubber pad with the inner wall abutting against the convex surface of the second arch frame is arranged between the two second clamping grooves; when the first aluminum profile and the second aluminum profile are buckled, a five-fold sealing structure is formed, so that the sealing performance is effectively improved; and moreover, a detachable structure is formed between the third rubber pad and the first clamping groove and between the fourth rubber pad and thesecond clamping groove, so that the four-fold sealing is interchangeable with the five-fold sealing, and the universality is high.