The utility model discloses a vacuum system for retort, including water pump, jet pump, filtration jar, condenser, water tank, blast pipe, blow off pipe, water pump, jet pump, water tank pass through two liang in pipeline and connect circulation of formation, the jet pump is still through the pipeline through straining a jar connection condenser, be provided with first air inlet on the condenser, the water tank still respectively with blast pipe and sewage pipe connection, filter the jar and still be connected with the blast pipe, and be provided with discharge valve between filtration jar and the blast pipe, the filtration jar is gone back and sewage pipe connection, and is provided with first blowoff valve between filtration jar and the blow off pipe, be provided with the second blowoff valve between water tank and the blow off pipe. The beneficial effects of the utility model are that most water, oil vapour from first air inlet gets into are removed through the condenser condensation to make during this vacuum system for retort can directly be used in the environment that contains a large amount of water, oil vapour, and have with low costs, the noise low, simple structure, the convenient characteristics of maintenance.