A water-cooled electric engine comprising a housing, a fore bearing, a shaft, a rotor, a stator, an oil-lubrication mechanism for the fore bearing, wherein the oil-lubrication mechanism comprises a gear-splashing oil-storage structure configured to be provided in a gearbox or a reduction gearbox, and a bearing-baffle oil-storage structure provided at a front end of the water-cooled electric motor, the gear-splashing oil-storage structure and the bearing-baffle oil-storage structure are communicated by an oil conduit, and the bearing-baffle oil-storage structure and the gearbox or the reduction gearbox are communicated by an oil return tube; and a gear in the gearbox or the reduction gearbox in operation throws a lubricating oil into the gear-splashing oil-storage structure, and the lubricating oil is delivered via the oil conduit into the bearing-baffle oil-storage structure, thereby lubricating the fore bearing of the water-cooled electric motor, and subsequently the lubricating oil flows back into the gearbox or the reduction gearbox via the oil return tube; the bearing-baffle oil-storage structure comprises a bearing seat provided at a front end of a housing of the water-cooled electric motor, the fore bearing of the water-cooled electric motor is provided in the bearing seat, characterized in that a bearing baffle for half-closing the bearing seat is provided at a rear end of the bearing seat, the fore bearing of the water-cooled electric motor presses against the bearing baffle, and the lubricating oil stored at a bottom of the bearing seat lubricates the fore bearing of the water-cooled electric motor; and a gap is provided between an inner bore of the bearing baffle and the shaft of the water-cooled electric motor, and when a liquid level of the lubricating oil stored at the bottom of the bearing seat is higher than an edge of the inner bore of the bearing baffle, the lubricating oil flows out of the bearing seat, and flows into the housing of the water-cooled electric motor. a gear in the gearbox or the reduction gearbox in operation throws a lubricating oil into the gear-splashing oil-storage structure, and the lubricating oil is delivered via the oil conduit into the bearing-baffle oil-storage structure, thereby lubricating the fore bearing of the water-cooled electric motor, and subsequently the lubricating oil flows back into the gearbox or the reduction gearbox via the oil return tube; the bearing-baffle oil-storage structure comprises a bearing seat provided at a front end of a housing of the water-cooled electric motor, the fore bearing of the water-cooled electric motor is provided in the bearing seat, characterized in that a bearing baffle for half-closing the bearing seat is provided at a rear end of the bearing seat, the fore bearing of the water-cooled electric motor presses against the bearing baffle, and the lubricating oil stored at a bottom of the bearing seat lubricates the fore bearing of the water-cooled electric motor; and a gap is provided between an inner bore of the bearing baffle and the shaft of the water-cooled electric motor, and when a liquid level of the lubricating oil stored at the bottom of the bearing seat is higher than an edge of the inner bore of the bearing baffle, the lubricating oil flows out of the bearing seat, and flows into the housing of the water-cooled electric motor.