A reverse osmosis desalination module comprising: four sequentially docked units: a hydraulic drive unit, a filter unit, a hydraulic manifold unit, and a membrane element unit, wherein the hydraulic drive unit comprises an electric motor and a high-pressure axial plunger pump, a recuperator, and a booster pump provided structurally in a single unit, wherein the filter unit comprises a housing receiving a filter element, wherein the housing of this unit contains a duct to deliver salt water from the hydraulic manifold unit to the filter element, a duct to deliver salt water from the filter element to the hydraulic drive unit, a duct to deliver brine from the hydraulic manifold unit to the hydraulic drive unit, a duct to withdraw brine from the hydraulic drive unit to the hydraulic manifold unit, and a duct to deliver salt water from the hydraulic drive unit to the hydraulic manifold unit, wherein the membrane element unit comprises a reverse osmosis membrane element and a housing to receive the reverse osmosis membrane element and a separate duct to deliver salt water to the reverse osmosis membrane element, wherein the hydraulic manifold unit has a housing capable of being joined to the housing of the hydraulic manifold unit of an adjacent reverse osmosis desalination module and is made with the following ducts being arranged inside the housing: three main ducts: a duct to deliver low-pressure salt water to the filter unit, said low-pressure salt water being filtered before delivery to the hydraulic drive unit, a duct to withdraw low-pressure brine from the hydraulic drive unit and to remove filtered particles from the filter unit, and a duct to withdraw desalted water from the membrane element unit; a duct to deliver high-pressure salt water to the membrane element unit, wherein said high-pressure salt water is delivered through the filter unit from the hydraulic drive unit, and a duct to withdraw high-pressure brine from the membrane element unit to the hydraulic drive unit through the filter unit, and wherein the hydraulic manifold unit performs a supporting function for connection of the module units (2, 3, 4) of the reverse osmosis desalination module and for connection of several autonomous reverse osmosis desalination modules in a reverse osmosis desalination plant. four sequentially docked units: a hydraulic drive unit, a filter unit, a hydraulic manifold unit, and a membrane element unit, wherein the hydraulic drive unit comprises an electric motor and a high-pressure axial plunger pump, a recuperator, and a booster pump provided structurally in a single unit, wherein the filter unit comprises a housing receiving a filter element, wherein the housing of this unit contains a duct to deliver salt water from the hydraulic manifold unit to the filter element, a duct to deliver salt water from the filter element to the hydraulic drive unit, a duct to deliver brine from the hydraulic manifold unit to the hydraulic drive unit, a duct to withdraw brine from the hydraulic drive unit to the hydraulic manifold unit, and a duct to deliver salt water from the hydraulic drive unit to the hydraulic manifold unit, wherein the membrane element unit comprises a reverse osmosis membrane element and a housing to receive the reverse osmosis membrane element and a separate duct to deliver salt water to the reverse osmosis membrane element, wherein the hydraulic manifold unit has a housing capable of being joined to the housing of the hydraulic manifold unit of an adjacent reverse osmosis desalination module and is made with the following ducts being arranged inside the housing: three main ducts: a duct to deliver low-pressure salt water to the filter unit, said low-pressure salt water being filtered before delivery to the hydraulic drive unit, a duct to withdraw low-pressure brine from the hydraulic drive unit and to remove filtered particles from the filter unit, and a duct to withdraw desalted water from the membrane element unit; a duct to deliver high-pressure salt water to the membrane element unit, wherein said high-pressure salt water is delivered through the filter unit from the hydraulic drive unit, and a duct to withdraw high-pressure brine from the membrane element unit to the hydraulic drive unit through the filter unit, and wherein the hydraulic manifold unit performs a supporting function for connection of the module units (2, 3, 4) of the reverse osmosis desalination module and for connection of several autonomous reverse osmosis desalination modules in a reverse osmosis desalination plant.