The invention provides a turbocharger for double-vane nozzle systems, which comprises a turbine casing, a fixed nozzle ring, a linearly moving nozzle disk, a middle shell, a rack, rocking levers and gears, wing-shaped fixed vanes are arranged on the front end surface of the fixed nozzle ring, vane-shaped holes are arranged between the fixed vanes, the fixed nozzle ring is mounted on the outer circle of the middle shell, and is fixed on the middle shell by bolts, the linearly moving nozzle disk is mounted on the rear end of the fixed nozzle ring, a group of movable vanes are arranged on the front end surface of the linearly moving nozzle disk, and are movably inserted into the vane-shaped holes, the rear end surface of the linearly moving nozzle disk is firmly connected with the two rocking levers, and the rocking levers are inserted into the middle shell, and are engaged with the rack through the gears. Since the new vanes of the turbocharger for double-vane nozzle systems are arranged along a nozzle flow passage, not only can the sectional area of the passage be reduced, but also the original nozzle is divided into two air passages, so that the transverse flow loss of air flow can be reduced. Meanwhile, the air still flows according to the optimal air flow angle of the original design, so the operation of the turbine can be kept in the high-efficiency area.