The invention relates to a high aspect ratio micro-hole impact extrusion compound molding method. The invention aims at solving the problems that the prior micro-hole is extrusion-molded, the deformation resistance is big, a punch is easy to wear, and the dimensional precision and the surface quality of the micro-hole part are difficult to ensure. The device is as follows: the punch is arranged in a die seat hole, a die plate hole and a punched hole, the effective length section of the punch is divided into a first section, a second section, a third section, a fourth section and a fifth section from the top to the bottom, the first section, the third section and the fifth section are cylindrical, the diameters thereof are sequentially gradually reduced from the top to the bottom, and the second section and the fourth section are round tables. The method comprises the following steps: 1, mounting an upper die and a lower die; 2, preheating a billet; 3, impact extrusion molding; 4, demolding the billet; 5, grinding; and 6, scouring, thereby obtaining the high aspect ratio micro-hole. The device and the method are used for the impact extrusion molding, when in impact extrusion, the effective section of the punch and the micro-hole generate shear deformation, so that the flow of the residual materials is smooth, the deformation resistance is small, the punch is not easy to wear, and the molding dimensional precision and the surface quality of the micro-hole are improved.