Multifunctional plastic extruder

The utility model belongs to the technical field of plastic extrusion instruments, and particularly relates to a multifunctional plastic extruder which comprises a main body, a feeding hole is formed in one side of the upper end of the main body, a base is arranged at the lower end of the main body, two connecting blocks are arranged on each of the two sides of the main body, long rods are arranged in the connecting blocks, and the long rods are connected with the feeding hole. A universal wheel is arranged at one end of each long rod, a ventilation plate is arranged on one side of the main body, through rotation of a second gear, a first gear drives a first rack to move, the first rack drives the other first gear to rotate, a second screw rod and a first screw rod rotate, and the first screw rod and the second screw rod drive a screw sleeve to move up and down; the screw sleeve drives the main body to move up and down, and the long rod is pulled to move to a proper position after the main body reaches the pr