The invention discloses a hot air utilizing device realizing high-efficiency utilization of energy. The two ends of a hot air passage are separately provided with a hot air inlet and a hot air outlet;pneumatic blades are arranged inside the hot air passage; the pneumatic blades rotate with flowing of the hot air inside the hot air passage; the hot air passage is externally sleeved with an annularenergy utilization chamber; and a kinetic energy transformation mechanism is positioned inside the annular energy utilization chamber and rotates with the pneumatic blades so as to heat the air inside the annular energy utilization chamber. By the optimized design, the hot air utilizing device realizing high-efficiency utilization of energy is optimized and reasonable in structural design; the hot air passage is externally sleeved with the annular energy utilization chamber, therefore on the one hand, the kinetic energy transformation mechanism acts through rotation so as to perform frictionheating on the air inside the kinetic energy transformation mechanism; on the other hand, the annular energy utilization chamber is used for maintaining the temperature of the hot air passage; the heat dissipated in the hot air passage can perform heat exchange with the air inside the annular energy utilization chamber, so the cyclic utilization rate of hot air is further increased.