To provide a method for heat-treating a blood of a livestock, etc., capable of preventing the generation of foul smell and a device from the scorching of the blood component by continuously heat-treating the discharged blood, and a device therefor.

This method for heat treating a discharged blood of a livestock, etc., is to fill a boiling vessel 1 with water, heat the water close to boiling point thereof, rotate a screw conveyer 2, charge the blood 41 from a charging port 4 and at the same time inject a steam 51 form a steam injecting port 5, transfer the blood 41 in a direction to an opening part 11 by a rotation of the screw conveyer 2, discharge the gelled blood component 41a from the opening part 11, and separate the blood component 41a from water in a separating vessel.