A movable sprinkler fixing device comprises a sprinkler support bar provided with a sprinkler fixing seat for fixing a sprinkler, wherein the support bar comprises a fixed bar and a lifting bar; the upper part of the fixed bar is communicated with the lifting bar; the lower part of the fixed bar is provided with two passages which are communicated with the lifting bar, a water inlet and a water outlet; the inside of the fixed bar is provided with a movable switching piece capable of switching the two passages which are arranged at the lower part of the fixed bar and communicated with the lifting bar; the fixed bar is provided with two limiting blocks to be connected with the switching piece; the inside of the lifting bar is provided with a piston sleeved with a magnetic ring outside; a magnetic ring is arranged at the position where the sprinkler fixing seat is sleeved on the lifting bar to fit the lifting bar, and, at the same time, the sprinkler fixing seat depends on the two limiting blocks arranged on fixed bar for travel limitation. A switching bar controls the water inlet passages to allow water to enter from the upper part of the lifting bar or from the lower part of the lifting bar to push the piston in the lifting bar to move in a down and up mode so as to realize that the sprinkler moves in an up and down mode for sprinkling water.