Plastic extruding machine with curve-shaped machine neck flow channel

The invention discloses a plastic extruding machine with a curve-shaped machine neck flow channel. The plastic extruding machine is provided with the machine neck flow channel, wherein the longitudinal cross section of the machine neck flow channel is curve-shaped; a curve formula is that y=ax ; a=D-d/2-R; R is the radius of a circular arc on the edge of a horn; D is the large caliber of the horn, namely the inner diameter of a spiral barrel of a machine body; and d is the small caliber of the horn, namely the diameter of a hole in an inflow machine head. Due to reasonable setting of the shape of the machine neck flow channel, the machine neck flow channel is matched with the flow characteristics of a plastic melt in a smelting state, so that an extruded high polymer melt in the flowing process applies uniform pressure to each bedding surface, and has increased flow velocity and a uniform temperature; and dead angles do not exist in the curve-shaped flow channel, and the defects of rigid blocks and the like o