The utility model discloses a stirrer of a mud degasser, which is provided with a motor (1), a stirring shaft (3) and a stirring head (4). The stirrer of the mud degasser is characterized in that a connector (2) is arranged between the motor and the stirring shaft, and can be assembled and disassembled conveniently; the stirring head at the lower end of the stirring shaft and the stirring shaft are fixedly connected with each other, and can be assembled and disassembled conveniently; the connector is screwed with the motor through a screw, and is fixedly connected with the stirring shaft through a radial bolt; the stirring head is fixedly connected with the stirring shaft through a radial bolt; a stirring vane (4.1) is arranged on the stirring head, and can be replaced conveniently. The stirrer is suitable for being used as the stirrer of the mud degasser; the structure is novel; the use is convenient and flexible; and the range of applicable mud is wide.