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This invention discloses a feed cooling and grading sieve, relating to the field of feed cooling and grading technology. It includes a central cylinder and a sieve cylinder, the sieve cylinder rotating relative to the central cylinder, the central cylinder and the sieve cylinder being coaxially arranged, forming an annular cavity between them; an isolation ring and a spiral ring, the isolation ring being fixedly connected to the central cylinder, the spiral ring being disposed on the inner wall of the sieve cylinder and rotating with the sieve cylinder, the isolation ring dividing the annular cavity into multiple zones; a connecting component for connecting or closing adjacent zones; a venting ring and a conveying pipe, an air compressor delivering high-pressure cold air through the conveying pipe to the venting ring, the venting ring being connected to the annular cavity. The beneficial effects of this invention are that the annular cavity allows for cooling and grading of materials within it, resulting in a more compact space for the materials. The zoned material arrangement prevents hot materials entering the sieve cylinder from sharing the same temperature environment with cold materials exiting the sieve cylinder, avoiding airflow turbulence and ensuring that the materials are cooled strictly according to a temperature gradient.