The invention relates to a vacuum receiving device for chamber water in an oil stain vessel, which belongs to the field of vessel sewage treatment and environment protection. The vacuum receiving device of chamber water in an oil stain vessel adopts two parallel-connected vacuum diversion canisters. The electronic control unit controls the opening and closing of an electromagnetic valve according to the liquid position signal detected by a level gauge. The compressed air opens the corresponding pneumatic valves for ensuring that another vacuum diversion canister can be opened and drained when one vacuum diversion canister is vacuumized and drew water. The two vacuum diversion canisters can alternately draw water and drain, so the draining work can continuously be carried out. The whole draining process has no mechanical stirring, therefore, a secondary emulsification can be avoided when the chamber bottom water in the transportation process. The vacuum receiving device has the advantages of low investment, energy saving, stable operation with safety and reliability, as well as a high automatic degree and convenient maintenance and management.