The utility model relates to an external hole punching mechanism which is characterized by adopting an external prestress frame structure and comprising a hole punching frame (3), a hole punching movable beam (4), a hole punching main cylinder (1), a hole punching side cylinder (2) and a hole punching connection rod system (5). The hole punching frame (3) is connected with an extruder back beam (10), the hole punching main cylinder (1) and the hole punching side cylinder (2) are connected with the hole punching movable beam (4), the tail end of the hole punching connection rod system (5) is installed on the hole punching movable beam (4), and the front end of the hole punching connection rod system (5) penetrates through the main cylinder (1), a main plunger (9) and an extrusion rod (15). The external hole punching mechanism is applied to an extra-heavy type extrusion device, achieves the effect that a hole punching system of the extra-heavy type extrusion device runs rapidly, improves fixed needle positioning accuracy and reduces energy consumption in bottle needle extrusion.