2SK-B water-ring vacuum pump is a double-stage water-ring vacuum pump with excellent property. The product adopts belt transmission and uses copper impellers and a mechanical sealing device, and a pump cavity undergoes coating treatment. The pump has the characteristics of high vacuum degree, big air-pumping amount in high vacuum area, small volume, low energy consumption, low noise, convenient maintenance and smooth operation, and is widely applied to equipment of food, medical packaging, sterilizing equipment, vacuum condensation, etc.