The invention discloses a honeycomb type reducing pipe heat radiator which comprises an upper water chamber and a lower water chamber. The upper water chamber is provided with a water inlet; the lower water chamber is provided with a water outlet; cooling pipelines are tightly arranged between the upper water chamber and the lower water chamber; each row of cooling pipelines comprises upper cooling chambers and lower cooling chambers which are horizontally distributed; the upper cooling chamber and the lower cooling chamber which are adjacent are communicated; the cooling chamber at the uppermost end is communicated with the upper water chamber, the cooling chamber at the lowest end is communicated with the lower water chamber, and a ventilating pipe is installed in each cooling cavity. The ventilating pipe is installed in each cooling cavity of the cooling pipelines so that the fluid is in a turbulence state in the cooling chambers of the cooling pipelines; the fluid mutually impacts a retaining layer of the pipe wall in the flow process by the inner walls of the cooling chambers and the size change of the outer wall of the ventilating pipe, the heat resistance is reduced, and the heat exchange efficiency is improved; meanwhile, a ventilating passage between the ventilating pipe and the cooling pipelines plays a favorable role of heat radiation; and the invention has the characteristics of reasonable and simple structure, easy processing and strong heat radiating performance.