The positive pressure protective hood is connected to the electric air supply device through a gas duct, and the airflow is blown from the front of the forehead to the lens through the head gas duct, which can maintain the mirror surface from fogging for a long time and avoid discomfort caused by the airflow directly blowing towards the head or forehead. Gas can create a slight positive pressure inside the hood, effectively preventing external toxic gases from entering. Compared with self suction filtering protective equipment, it improves the gas protection ability, and the gas inside the hood is discharged through the neck sleeve; The front and rear cloaks can effectively prevent the infiltration of splashed liquids, and compared with the overlapping combination of traditional one-piece protective clothing and filter masks, they effectively improve the liquid protection ability. The cloak has four buckles in front, back, left, and right, which are connected to the protective clothing to secure the cloak from rolling up.