The invention discloses a novel simple screw extruder. The novel simple screw extruder comprises a handle, a screw, a piston, a fixing square block, a material barrel, a nozzle adapter, a heating jacket and a brass nozzle and is characterized in that a thread groove is formed in the middle of the handle; the upper end of the screw is screwed into the thread groove; the lower end of the screw is fixed with the piston; the piston is inserted into the fixing square block; an inner thread is designed at the lower end of the fixing square block; an outer thread is designed at the upper end of the material barrel; the material barrel is directly screwed into the fixing square block; the material barrel can penetrate through the circle at the middle of a fixing plate; the fixing square block is clamped in a square groove in the fixing plate; the nozzle adapter is fixed at the lower end of the material barrel; the material barrel is wound with the circle of heating jacket; and the nozzle adapter is screwed into the brass nozzle. The novel simple screw extruder has the advantages as follows: a small amount of polymerized substances can be extruded to form filaments, the extruded filaments are uniform, and the device body is easy to clean, convenient to use and low in manufacturing cost.