To reduce occurrence of flush steam even in a case where a plurality of load devices with different drain pressures are connected to a drain tank.

A drain recovery system includes: load devices 2A, 2B for discharging drains; a steam boiler 3 for supplying steam to the load devices 2A, 2B; and a hermetic type drain tank 6 for storing the drains discharged from the load devices 2A, 2B and supplying the stored drains to the steam boiler 3. The load devices 2A, 2B are connected to each other in parallel, comprises a load device for discharging drains with different pressures, and includes drain pumping means 8 for pumping the drains into the drain tank 6 through a drain return line 4B of the load device 2B for discharging a low-pressure drain.