The invention provides a waste heat utilization heat pipe system of a trapezoidal air channel. The system comprises heat pipes; each heat pipe comprises a vertical part, a horizontal part and verticalpipe bodies; the bottom ends of the vertical parts communicate with the horizontal parts; the horizontal parts extend from the bottom ends of the vertical parts to the direction away from the vertical parts; the lower portions of the horizontal parts communicate with the multiple vertical pipe bodies, and the vertical pipes are evaporation ends of the heat pipes; the vertical parts are condensation ends of the heat pipes; the vertical pipe bodies are located in a flue gas channel; the vertical parts are located in the air channel; the flue gas channel is of an arc structure; the air channel is of a trapezoidal structure; the upper bottom of the trapezoid structure is located on the upper portions of the vertical parts; and the lower bottom of the trapezoid structure is located on the upper wall surface of the flue gas channel. The system has the advantages that the novel trapezoid structure is arranged so that the heat exchange efficiency can be further improved, in addition, the trapezoid structure is arranged so that the external structure can be compact, and the external space can be fully utilized, for example, other components such as a pipeline can be arranged at the position of a waist of the trapezoidal structure.