The utility model relates to a calcium ion powder capsule, which comprises a capsule cap, a capsule body and an adhesive tape, wherein the capsule cap is connected with the capsule body through the adhesive tape; space is formed between the capsule cap 1 and the capsule body 2, and an ionized calcium water-soluble preparation is filled in the space; the capsule cap consists of a cap top and a cap wall; a lock ring is arranged at a joint of the cap top and the cap wall; a pre-locking point is arranged in the middle of the cap wall; a guiding taper opening is formed in the bottom of the cap wall; the capsule body consists of a body top and a body wall; a pre-locking ring is arranged on the top of the body wall; and an exhaust hole is formed in one side of the pre-locking ring. The pre-locking ring is matched with the lock ring, and the pre-locking ring is fixedly connected with the lock ring through the adhesive tape. The pre-locking point is positioned under the exhaust hole. The calcium ion powder capsule has the advantages that after being mixed with water, the calcium ion powder capsule becomes ionized calcium activated water which is absorbed by a human body easily, the potential of hydrogen (pH) value of the calcium ion powder capsule is 14 after the calcium ion powder capsule is mixed with the water, the calcium ion powder capsule is alkaline, the acid-base balance of the human body can be adjusted, and various trace elements and mineral substances which are required by the human body are supplemented.