A rotatable water-spraying bat is disclosed. The bat comprises a soft material mount, a water storage cylinder and a push pushing-piston. The soft material covers the external of the water storage cylinder, and the inner diameter of the water storage cylinder provides the insertion of the pushing-piston cylinder as one unit. The bat is characterized in that at an open area of the water storage cylinder being provided with two fastening ring is mounted with a recess for the insertion of the corresponding L-shaped fastening plate and is then rotated, the protruded ring urges the recess to be in a fastening position so that the great impact onto the spray bat will not dislocate the spray bat the guiding corner at the front end of the recess allows the protruded ring to be engaged and dislocation is not possible.