Abstract: The invention discloses an integrally transparent and foldable positive-pressure biological protective hood. The invention includes a protective hood, an overall waterproof air supply system, and a backpack for the air supply system. The hood of the protective hood is provided with a protective shawl, the neck is provided with a neck sleeve which can be ventilated and tightened, and a one-way exhaust valve is provided on the top of the head. The protective hood and the air supply system are connected by an air supply hose. The air supply system is installed in a backpack, and is powered by a fan, which drives the air to be purified through a high-efficiency filter tank and then sent to the protective hood. The air supply system has an overall waterproof function. The protective hood can be reused, and the air supply system can be charged and reused. Compared with ordinary protective masks or masks, the protective hood has higher protection ability, better comfort and lower use cost.