The invention discloses a full-automatic degassing machine, comprising a degassing barrel (2), a slurry inlet (1), a slurry outlet (6), a stirring and crushing device (3) and a motor. The invention is characterized in that the full-automatic degassing machine also comprises an air cavity (7), an air inlet (8), an oil gas suction inlet (9), a lifting support sliding rod (21), a guide rail locatingplate (12), a double spindle lifting cylinder (24) and a brake friction plate (30), and a first ultrasonic wave probe (15), a second ultrasonic wave probe (16), a slurry blocking detection device (25) and an automatic drainer (26), and the double spindle lifting cylinder (24), a braking cylinder (28), the slurry blocking detection device (25), the motor (13), the first ultrasonic wave probe (15) and the second ultrasonic wave probe (16) are all connected with an electric control device (31). The full-automatic degassing machine disclosed by the invention has a reasonable design, a simple structure, economy and practicability, convenience in operation, good degassing efficiency, high efficiency, long service life and simplicity in mounting and dismounting.