The invention discloses a low-pressure drying system for duck manure, belonging to the technical field of environment-friendly treatment of livestock and poultry manure. According to a technical scheme in the invention, a low-pressure drying system for duck manure comprises a closed tank, a support, an air exhausting component, an air inflation component, a stirring unit and a manure outlet unit,wherein the top of the closed tank is provided with a manure adding port; the bottom of the closed tank is provided with a manure outlet; the support is arranged at the bottom of the closed tank; theair exhausting component and the air inflation component are arranged at the two ends of the top of the closed tank respectively; the stirring unit penetrates through the two ends of the closed tank and is arranged in the middle part of the closed tank; and the manure outlet unit is arranged on the manure outlet and seals the manure outlet. The low-pressure drying for duck manure system has the beneficial effects of capacity of performing efficient dehydration treatment, low cost, low energy consumption and short process route.