Provided is a center bracket for fixing a fire sprinkler and, more particularly, to a sprinkler center bracket having a one-touch-type structure, to which a locker for preventing loosening of a cam lever is coupled. When a locker protrusion is inserted into a locker protrusion hook groove formed in one end portion of a cam protrusion contact portion, wherein the locker protrusion is rotated about a fixing tool of the locker for preventing loosening of the cam lever as a central axis of rotation, the cam lever is rotated in a locking direction in order to fix the sprinkler, and after this, loosening of the cam protrusion contact portion in a direction opposite to the locking direction can be prevented, the cam protrusion contact portion being fixed by an elastic spring hinge pin after the cam lever is rotated in the locking direction to fix the sprinkler.