Small 
seawater desalting equipment with an 
energy recovery device applicable to a new-energy independent 
power grid comprises a 
raw water pump and a multi-level filter device. The multi-level filter device is connected with the 
raw water pump by a water inlet, a water outlet of the multi-level filter device is connected with a water inlet of a 
reverse osmosis membrane by a high-pressure pump, a 
branch of a 
fresh water outlet of the 
reverse osmosis membrane is connected with a cleaning water tank by a pipeline and a water replenishing valve, another 
branch of the 
fresh water outlet of the 
reverse osmosis membrane is connected with 
fresh water storage equipment by a pipeline and a water producing valve, a 
branch of a high-pressure strong brine outlet of the reverse 
osmosis membrane is connected with the cleaning water tank by a pipeline and a cleaning water return valve, another branch of the high-pressure strong brine outlet of the reverse 
osmosis membrane is connected with the 
energy recovery device, the 
energy recovery device and the high-pressure pump share the same coaxial motor, and the motor is connected with a frequency converter. The energy 
recovery device connected with the high-pressure pump by the motor is arranged at the high-pressure strong brine outlet of the reverse 
osmosis membrane, high-pressure hydraulic power of high-pressure strong brine is converted into 
mechanical energy by the device to be used by the motor, energy is recovered, and water producing 
energy consumption is effectively reduced.