The invention relates to a material conveying method of a horizontal vacuum furnace. A driving trolley and a conveying trolley are adopted, wherein the conveying trolley is used for loading materials, the driving trolley is used for pushing the conveying trolley, and trolley running tracks are respectively arranged inside and outside a vacuum furnace body. The method comprises the following steps: the driving trolley is connected with the conveying trolley through a connecting pin shaft; the driving trolley pushes the conveying trolley to enter the vacuum furnace body; and the conveying trolley is completely pushed into the vacuum furnace body by the driving trolley, the connecting pin shaft between the conveying trolley and the driving trolley is taken down, and then, the driving trolleyreturns to the standby position. According to the material conveying method of the invention, the material conveying process is completed by two trolleys; the trolley running tracks are also divided into two sections, wherein one section of track is positioned outside the furnace body, and the other section of track is positioned inside the furnace body; the space between the two sections of tracks is used for opening and closing a sealed door of the vacuum furnace; and the trolley for loading is pushed in or pulled out of the furnace body by the trolley for providing power. Thus, cables can not follow and enter the furnace body, the problem of track extension can not occur, and the vacuum furnace can be completely sealed, thereby reducing unnecessary leakage points and achieving the requirement of high vacuum degree.