The invention discloses a hot sawing machine, particularly discloses a hot sawing machine with a water retaining shield, belongs to the technical field of heat rolling equipment, and provides the hot sawing machine with the water retaining shield, of which the probability of the breakdown of the water retaining shield during the running of the hot sawing machine is extremely low. The hot sawing machine comprises a water retaining shield and a hot sawing machine saw shield capable of rotating around a hinge point, wherein the water retaining shield is movably mounted on the hot sawing machine saw shield; and the water retaining shield is lifted under the action of external force during the process that the hot sawing machine saw shield rotates along with the hot sawing machine to saw a rolled piece, and resets and covers a saw blade mounted inside the hot sawing machine saw shield under the action of own gravity during the process that the hot sawing machine is lifted after the rolled piece is sawed by the hot sawing machine.