The invention relates to a punching die for drainage holes of stainless steel tubes, which is characterized by comprising an upper die and a lower die. The upper die comprises a die handle (201), an upper die plate (202), a cushion plate (203), a fixed plate (207) and a plurality of abreast punching heads (205). The lower die comprises a product location device (301), a left location plate (320), a right location plate (303), a lower fixing plate (317) and a bottom plate (316), wherein the lower fixing plate (317) is arranged at the upper end face of the bottom plate (316), the left location plate (320) is positioned on the left side of the lower fixing plate (317), the right location plate (303) is installed on the right side of the lower fixing plate (317), the product location device (301) is arranged on the left side of the left location plate (320), and stainless steel tube insertion holes are arranged on the right location plate (303). The punching die for drainage holes of stainless steel tubes is small in manual operation and high in production efficiency.