Abstract: A multi-height baseball hitting device includes a base plate assembly, a sleeve and a pipe. The sleeve is disposed on the base plate assembly. The sleeve has at least three positioning blocks extending from an inner wall of the sleeve. The pipe has a supporting portion, a connecting portion and a positioning portion. The supporting portion is connected with the connecting portion for supporting a ball. A plurality of ring-shaped rails are formed on the positioning portion and arranged from the connecting portion at equal intervals, and the positioning blocks of the sleeve are engaged with the ring-shaped rails, such that the pipe is adjustable to be fixed with plural heights, thereby meeting all of the heights of children and adults.