The invention discloses a low-temperature sludge drying treatment system. The low-temperature sludge drying treatment system comprises a dosage and flocculation unit, a condensation and dewatering unit, a shearing and granulation unit, a low-temperature drying unit and a discharging and packaging unit which are sequentially connected, wherein the dosage and flocculation unit comprises a flocculation tank and a stirring device arranged in the flocculation tank, the condensation and dewatering unit comprises a sludge dewatering machine, the shearing and granulation unit comprises a shearing and granulator, the low-temperature drying unit consists of a low-temperature sludge drying machine, a fan and a heat pump system. The technology comprises the treatment steps of 1) feeding a flocculating agent into sludge so as to promote the dewatering property; 2) dewatering the flocculated sludge; 3) performing shearing and granulation treatment on the dewatered sludge; 4) performing low-temperature drying treatment on the granulated sludge at 50-100DEG C; 5) performing vacuum bagged packaging on the dried sludge. The treatment system is less in occupied area, high in equalization degree, low in energy consumption, and incapable of producing secondary pollution in the treatment process.