The invention discloses a guard hood for a combined saw, which comprises an inner guard hood, an outer guard hood and a connecting rod mechanism, wherein the outer guard hood can descend along with the machine head of the composite saw and can be retracted into the inner guard hood; and the connecting rod mechanism can drive the outer guard hood to rotate. The outer guard hood is limited by a limiting plate. The connecting rod mechanism is arranged in the machine head of the composite saw. The top end of the machine head of the combined saw is provided with a self-locking button for controlling the action of the limiting plate. The guard hood for a combined saw has the advantages of skillful concept, smart structure and convenient use; the outer guard hood can rotate along with the descending of the machine head of the combined saw to enable the blade to expose; the guard range can be automatically adjusted, and the safety property is high.