The invention discloses a low-temperature waste heat recycling device. A cold water pipe is vertically arranged in an outer barrel, a rotary barrel is arranged between the outer barrel and the cold water pipe, the rotary barrel is connected with a rotary driving mechanism, the section of the side wall of the rotary barrel is of a square toothed structure, an outer partition plate is arranged on the inner wall of the outer barrel inwards in the radial direction, an inner partition plate is arranged on the outer wall of the cold water pipe outwards in the radial direction, a cold water channel is formed in the cold water pipe, the upper end of the cold water pipe is provided with a cold water inlet, the lower portion of the cold water pipe is provided with a cold water outlet hole, a waste heat water channel is formed between the outer barrel and the rotary barrel, the upper portion of the outer barrel is provided with a waste heat water inlet, the lower portion of the outer barrel is provided with a waste heat water outlet, a warm water channel is formed between the rotary barrel and the cold water pipe, the warm water channel communicates with the cold water channel through the cold water outlet hole, the upper portion of the rotary barrel is provided with a warm water outlet hole, a warm water collector is arranged outside the warm water outlet hole, and the warm water collector is provided with a warm water outlet. The low-temperature waste heat recycling device has the advantages of being simple in structure, low in manufacturing cost and high in heat exchange efficiency.