The utility model discloses a powder material's quartzy device is calcined in vacuum, it includes box resistance furnace, quartz capsule, high vacuum valve, vacuum pump, silica wool and corundum crucible, the quartz capsule is placed perpendicularly in the box resistance furnace of upper end trompil, quartz capsule upper end opening, is the internal diameter 15 40mm, is the wall thickness 1 5mm, is length 500 1000mm, quartz capsule upper end with high vacuum valve connects, and the junction scribbles refractory seals oil, high vacuum valve locates to connect silica wool separation temperature is put to vacuum pump, lower extreme, corundum crucible places in the quartz capsule, will test the sample during use and put into corundum crucible, uses the vacuum pump evacuation. The device adopts the quartz capsule equipment, and is sealed respond well, convenient to use. The leakproofness of whole device is good, can effectively prevent the material oxidation, to volatilizing under high temperature or having a material of toxicity, also can be fine sealed, prevent environmental pollution. The quartz capsule can used repeatedly, the effectual synthetic economic cost of material preparation that has reduced.