The invention discloses a vacuum entrained-material freezer with an interception function and relates to the technical field of negative-pressure distillation of fatty acid in oleochemical industry. The vacuum entrained-material freezer is characterized in that a plurality of baffling plates are arranged in a drum body and between a gas inlet and a gas outlet along the length direction of the drum body; the upper ends of all the bafling plates are respectively connected with the inner wall of the drum body; each two adjacent baffling plates are provided with opposite small semicircular gaps along the horizontal direction in the drum body; and the parts, near the lowest end of all the baffling plates, of the drum body are respectively provided with a flow guiding hole, and flow guiding pipes are connected onto all the flow guiding holes. The vacuum entrained-material freezer disclosed by the invention can be connected to the front of an inlet of a vacuum pump in series, and has the advantages that stearic acid contained in gas from a distillation kettle can be effectively separated, so that the purity of gas entering the vacuum pump is improved, the vacuum pump can be effectively protected from being blocked by stearic acid and smooth distillation can be guaranteed.