The invention discloses a high-density coupling double-effect enhancing pipe. The high-density coupling double-effect enhancing pipe comprises a pipe body and a plurality of high-density coupling double-effect fins; the high-density coupling double-effect fins and the pipe body are welded through brazing; the high-density coupling double-effect fins are distributed on the inner surface of the pipebody densely and uniformly along a circumferential direction; the number of the high-density coupling double-effect fins is determined by density, and the common density should be 38 to 47 percent; the so called density refers to the ratio of the sum of the cross area of all the fins to the cross area of the pipe body, and the value is determined jointly by the height, thickness and distance of the fins as well as the inner diameter of the pipe body; the high-density double-effect fins are not contacted mutually; the best effective height of the high-density coupling double-effect fins shouldbe maintained to be between 1/4 and 3/8 of the inner diameter of the pipe body; the high-density coupling double-effect enhancing pipe has a simple structure and various forms and is easy to processand manufacture, the heat exchange area in the pipe is effectively expanded; furthermore, due to internal medium flow type double-effect coupling, the turbulent degree is high, secondary flow is strong and enhanced heat exchange effect is good.