The invention discloses a composite biomass drying machine with scrapers and a turbine. The composite biomass drying machine comprises a dry material outlet, the turbine, a high-temperature heat source, air blowers, a high-temperature hot air channel, a roller, the horizontal scrapers, a scraper-type conveying belt, a main exhaust port, an auxiliary exhaust port, a motor, a low-temperature hot airchannel and a low-temperature heat source, wherein the roller is located at a biomass raw material inlet, the horizontal scrapers are perpendicular to the scraper-type conveying belt, the scraper-type conveying belt is vertically placed in the drying machine, the high-temperature heat source is connected with one air blower, the air blower is connected with the high-temperature hot air channel, the turbine is located at the bottom of the drying machine, the motor is in rigid connection with the turbine, the main exhaust port is located on one side of the scraper-type conveying belt, the auxiliary exhaust port is located in the middle of one side of the main exhaust port, the secondary exhaust port is connected with the low-temperature heat source through an air channel, the low-temperature heat source is connected with the other air blower, the air blower is connected with the low-temperature hot air channel, and the drying material outlet is located at the edge of the turbine. The biomass drying machine has the advantages that the structure is reasonable, the drying efficiency is high, and the phenomenon that biomass raw materials are bonded is avoided.