The invention relates to the technical field of oil field oil recovery engineering and belongs to a turbine injection increasing device applied to an oil-field separate injection well. The turbine injection increasing device is designed for solving the problems of too high liquid absorption amounts of high permeable layers and too low liquid absorption amounts of low permeable layers in three types of oil-field separate injection wells. The turbine injection increasing device consists of an upper joint (1), an upper connecting sleeve (2), a turbine housing assembly (3), a driving turbine (4), a bolt (5), a bearing (6), a driving shaft (7), a body (8), a lower connecting sleeve (9), a supercharged turbine (10) and a lower joint (11), wherein the turbine housing assembly (3) is fixed to the body (8) through the bolt (5), the upper portion of the driving shaft (7) is sleeved with the driving turbine (4) and the bearing (6), and the lower portion of the driving shaft (7) is sleeved with the supercharged turbine (10) and the bearing (6). The turbine injection increasing device is mainly applied to oil-field water-flooding, polymer-flooding and three-compound combination flooding separate injection wells and has the advantages of being compact in structure, convenient to operate and wide in application range, increasing the injection of low permeable layers and the like.