The present invention discloses a fully enclosed underground negative pressure tobacco stem feeding device, the feeding device comprising a
belt conveyor (1), a foundation pit (23), a dust removal duct (4), a material
discharge port (6), and an air suction chamber, wherein a first-stage grille (7) and a second-stage grille (8) are arranged below the material
discharge port, and the device is characterized in that: the air suction chamber comprises an
air chamber front bottom plate (5), an
air chamber rear bottom plate (9), and left and right
air chamber side plates (16), the air chamber front bottom plate, the air chamber rear bottom plate, and the left and right air chamber side plates are located at the periphery of the material
discharge port, the air chamber front bottom plate, the air chamber rear bottom plate, the left and right air chamber side plates, the material discharge port, and the foundation pit cover plate (10) together constitute the air suction chamber, and the air suction inlet of the air suction chamber is formed between the lower end periphery of the material discharge port and the air chamber front bottom plate, the air chamber rear bottom plate, and the left and right air chamber side plates. The fully enclosed underground negative pressure tobacco stem loading device facilitates material pouring and reduces labor intensity; a suction port is provided between the suction chamber and the material pouring port, which can form a downward / suction
airflow at the material pouring port to take away the dust generated during material pouring and prevent the dust from spreading to the space above the ground, thereby effectively solving the problem of dust raised during material pouring.