The present invention relates to an extrusion device for extruding a solid-state raw material that contains moisture, the extrusion device comprising: a barrel having the shape of a hollow tube along the longitudinal direction, a hopper being coupled to one side of the barrel such that a raw material is introduced therethrough, a discharge port being formed through the other side thereof such that a dewatered raw material is discharged therethrough, and a slot portion being formed in a specific section between the discharge port and the hopper such that the inside and the outside communicate with each other therethrough; a screw mounted inside the barrel in a rod shape such that, while axially rotating in one direction, a raw material introduced from the hopper is transferred to the discharge port, a thread being formed on the outer peripheral surface of the screw; and a heater portion mounted on the barrel so as to heat the raw material. The raw material introduced into the barrel through the hopper is gradually heated by the heater portion while being transferred inside the barrel through the screw. The screw has a kneading zone formed such that raw materials transferred by the thread are compressed. The raw material is melted inside the barrel such that at least a part thereof undergoes a phase change to a liquid state. The heating temperature of the heater portion and the rate of a axial rotation of the screw are controlled such that the liquid-state raw material forms a sealing film that blocks the inner cross section of the barrel in the kneading zone.