The invention discloses an efficient cooling type long deep injection mold and a production method thereof. The injection mold comprises a mold holder, a mold core and a water cooling pipe; the mold core is arranged on the mold holder, the mold core is of a long columnar structure, the mold core is formed through stacked connection of multiple columnar blocks of flat structures in the axial direction of the mold core, the water cooling pipe is arranged in the mold core, the columnar blocks are provided with water cooling grooves used for arranging of the water cooling pipe, and each water cooling groove comprises a center pipe groove, an arc water cooling groove and a straight pipe groove. Stacked splicing of the columnar blocks is achieved, the water cooling pipe of a three-dimensional structure is arranged in the mold core, the injection product can be subjected to water cooling, the cooling effect is good, product scalding is avoided, the injection molding effect of the injection product is good, the surface quality is good, the production method adopting the injection mold is simple, reasonable, low in manufacturing cost, and good in machining precision, the injection mold is not prone to deforming, and the service life is long.