The invention discloses a slime drying device and aims at providing a slime drying device with stable drying quality and high efficiency. The slime drying device comprises a base, a sealed shell arranged on the base, two parallel rotating shafts which are rotatably arranged on the base and penetrate through the lower part of the shell, and a gear motor which is in drive connection with the rotating shafts, wherein the upper part of one end of the shell is provided with a feeding air-lock valve and an air inlet pipe, the lower part of the other end of the shell is provided with a discharging air-lock valve, and the upper part of the other end of the shell is provided with an air outlet; the rotating shafts are provided with multiple material lifting plates in a certain form; the lower part of the shell is provided with two parallel arc-shaped bottom cases; two rotating shafts are respectively arranged above the bottom cases, and the axes of the rotating shafts are parallel to those of the bottom cases; the material lifting plates on the rotating shafts are adjacent to the bottom walls of the bottom cases; the inner top walls of the shell is provided with an upper baffle which extends downwards, and the inner bottom wall of the shell is provided with a lower baffle which extends upwards; the upper baffle and the lower baffle are arranged in a staggered manner; the material inlet part of the discharging air-lock valve is higher than the material lifting plates on the rotating shafts.