Integrated blade type draught fan used for harvester

The utility model relates to an integrated blade type draught fan used for a harvester. The integrated blade type draught fan used for the harvester comprises a fan vane arranged inside the draught fan, the fan vane is formed by a complete round disc surface, a shaft hole is formed in the center of the disc surface, the disc surface is provided with a plurality of equal sectors, an inscribed circle process hole with two sides of the corresponding sector as tangent lines is formed in each sector, and the process holes are twisted at the tangent lines at the upper half parts to form a plurality of blades of the same specification and shape. The integrated blade type draught fan used for the harvester has the characteristics of being capable of being applied to various fields, simple in structure, high in practicability and high in work efficiency, simplifies the process needed by production, and is suitable for large-batch operation.