Abstract: A baseball bat structure comprises a baseball bat made up of a core layer and an enveloping layer bound outside the core layer thereof wherein the core layer is composed of a plurality of square central bodies securely glued together and concentrically arranged in rectangular array with each perpendicularly adjacent to the other thereof, and the enveloping layer is assembled by a plurality of force-applied bodies that are lengthwise applied to fasten via glue onto the central bodies thereof. Via the aforementioned structure, the baseball bat can facilitate an all-around performance of a batter.