The invention relates to a vacuum bottle assembling machine capable of detecting air tightness. The vacuum bottle assembling machine comprises a power distribution control cabinet, wherein an air tightness detection device, a cover sleeve device and a screwing device are arranged on the power distribution control cabinet from left to right; material-loading devices which are matched with the air tightness detection device are arranged on left and right sides of the air tightness detection device; the air tightness detection device comprises an air tightness detection base arranged on the power distribution control cabinet; an air tightness detection carrier is arranged on the air tightness detection base; the air tightness detection carrier is arranged on a moveable device which moves before and after the detection; a detection rotating capturing plate is connected with a detection rotating motor; the detection rotating capturing plate is matched with an opening/closing rotating arm for detection capturing plate. According to the invention, a material-taking device is used for realizing the cooperation of the air tightness detection device and the cover sleeve device, and meanwhile, a feeding device can be used for conveying the sleeved bottle body and bottle cap onto the screwing device for screwing; the integrated automatic operation is realized; the assembling efficiency is greatly increased; the excellent air tightness of the processed vacuum bottle can be guaranteed; the heat preservation effect is ideal.