The invention discloses a sand mold casting core-making process in the technical field of sand core manufacturing, and the process comprises the following specific steps: step 1, uniformly stirring and fully mixing casting sand and an adhesive; step 2, injecting the casting sand mixed in the step 2 into a mold; step 3, starting a compaction device to compact the casting sand in the mold; and step 4, after compaction is completed, taking out a sand core and drying the sand core. A rotating disc is arranged, a bidirectional rack moves up and down to drive the rotating disc to move synchronously, and the rotating disc rotates along an inner threaded pipe while moving up and down, so that a compaction hammer is driven to move up and down and rotate at the same time, the compaction hammer rotates when rising, the falling casting sand is thrown to all positions in the mold, and the thrown casting sand has certain impact force, and the role of compaction is achieved; and the compaction hammer rotates when descending to twist and compact the casting sand falling into the mold, so that on the one hand, the casting sand is compacted, and on the other hand, the periphery of the casting sand is extruded, and it is ensured that the casting sand can fill the corners of the mold.