Variable cross-section turbocharger

The invention relates to the technical field of turbochargers, in particular to a variable-section turbocharger which comprises a turbine shell with an air inlet and an air outlet, turbine blades are arranged at the air inlet, and the turbine blades are rotationally connected into the turbine shell around the axis of the turbine blades; an air blocking cylinder is slidably connected into the turbine shell, the opening size of the air inlet can be adjusted in the sliding process of the air blocking cylinder, and the air blocking cylinder is connected to the turbine shell through a spring; the gas inlet communicates with a waste gas channel, a rotating shaft is rotationally connected into the waste gas channel, a plurality of fan blades are arranged on the rotating shaft, and waste gas entering the waste gas channel pushes the fan blades to rotate around the axis of the rotating shaft; a sliding unit is slidably connected into the waste gas channel, the fan blades can push the sliding unit to slide and can be s