The utility model relates to a novel heat exchanger which is composed of an outer heat radiator (1), an inner heat radiator (3), a heat-conducting partition board (2), etc., wherein the heat-conducting partition board (2) is arranged between the outer heat radiator (1) and the inner heat radiator (3); a shaft (4) which is arranged in the outer heat radiator (1) is provided with a turbine wheel (5); the shaft (4) which is arranged in the inner heat radiator (3) is provided with a rotary vane (8); the turbine wheel (5) and the rotary vane (8) are provided with magnetic blocks (6, 9), and the two magnetic blocks (6, 9) which are separated by the non-ferromagnetic metal heat-conducting partition board (2) are mutually attracted; the shafts (4) which are positioned at both sides of the partition board (2) are coaxial shafts which do not rotate; the turbine wheel (5) in the outer heat radiator (1) is driven by a cooling medium to rotate; in the enhancement of the heat exchange of the cooling medium and the partition board (2), the turbine wheel (5) drives the rotary vane (8) in the inner heat radiator (3) to rotate by magnetic force transmission, the rotation of the rotary vane (8) enhances the heat exchange of the cooling medium and the partition board (2), thereby, heat exchange efficiency is improved, hot and cold mediums do not come into contact with each other, and the isolation is safe. The utility model which realizes unpowered heat exchange avoids the problem of transmission sealing, and the utility model realizes no leakage; when the water is used as the cooling medium, the heat transferring surface is not easy to scale. The utility model can be widely used in the heat exchange between two media of various viscosities.