An acid leaching ore pulp liquid drying pyrolysis device comprises an outer shell, ore pulp liquid pyrolysis disc sets arranged in the shell, a feeding pipe, a scraping knife, a steel brush, a material absorption device, a heat source system and a transmission device, wherein the feeding pipe, the scraping knife, the steel brush and the material absorption device are used in cooperation with the disc sets and arranged in the shell. The acid leaching ore pulp liquid drying pyrolysis device has the beneficial effects that compared with traditional liquid material drying equipment, the device is of a vertical structure, space arrangement is small, the material contact superficial area is enlarged, the drying pyrolysis efficiency is improved, and energy consumption is reduced; innovation is carried out on the basis of a traditional disc drying machine, an outer jacket type and disc hollow inner cavity dual heating system is adopted, the pyrolysis rate of pulp is increased, meanwhile, pulp liquid pyrolysis discs can rotate intermittently, other auxiliary components such as the scraping knife and the steel brush do not rotate, the number of rotating components is small, the device operating stability is good, and power consumption is low; and a dust suction manner is adopted by dry materials, and compared with a scraper blade chute structure, discharging is simple and thorough.