A continuous vacuum nitrogen-protection brazing furnace having a low energy consumption and a good brazing effect, comprising a rack (1) and a chain-type circulating conveying device (2) arranged on the rack (1), wherein a workpiece loading area (3), a drying furnace (4), a preheating furnace (5), a brazing furnace (6), a forced air-cooling area (7) and a workpiece unloading area (8) are sequentially arranged on the rack (1) from front to back; a preheating furnace nitrogen pipe (9) is arranged on the preheating furnace (5); a brazing furnace nitrogen pipe (10) is arranged on the brazing furnace (6); a vacuum purifying area (11) is arranged on the rack (1) between the drying furnace (4) and the preheating furnace (6); a vacuum purifying area nitrogen pipe (12) and a vacuum purifying area evacuation pipe (13) are respectively arranged in the vacuum purifying area (11); a vacuum purifying and cooling area (14) is arranged on the rack (1) between the brazing furnace (6) and the forced air-cooling area (7); a vacuum purifying and cooling area nitrogen pipe (15) and a vacuum purifying and cooling area evacuation pipe (16) are respectively arranged in the vacuum purifying and cooling area (14); and the preheating furnace nitrogen pipe (9), the brazing furnace nitrogen pipe (10), the vacuum purifying area nitrogen pipe (12) and the vacuum purifying and cooling area nitrogen pipe (15) are respectively connected to a nitrogen supplying device, and the vacuum purifying area evacuation pipe (13) and the vacuum purifying and cooling area evacuation pipe (16) are respectively connected to an evacuation device.
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