The invention discloses a bypass intake variable-area turbine unit, which comprises a turbine shell. A turbine shell intake main runner is arranged in the turbine shell and is provided with a turbine shell intake. A bypass intake runner is arranged on one side of the turbine shell intake main runner. A partition wall is arranged between the bypass intake runner and the turbine shell intake main runner. The turbine shell intake main runner is communicated with the bypass intake runner at a position close to the partition wall and far away from the end part of the turbine shell intake. A bypass runner intake is arranged on the partition wall. An air release valve is installed on the bypass runner intake. The invention can effectively ensure that a common turbine can satisfy the pressure increase requirement of an engine under all working conditions and has no the hazards of potential reliability, which exist in rotary vane type and axial moving type variable-area turbochargers and the product is simple and reliable. On the premise that the overall structure of the turbocharger is not greatly changed, the cost is close to the cost of a common bypass turbocharger and the realization is easy.