The invention discloses a multiprobe speed measuring method and device in a vacuum speed adjusting casting process. The device is provided with a seal container, wherein the seal container is used for achieving molten metal taking at the position of a smelting furnace or heat preservation furnace, casting of the molten metal can be achieved at the position of a mould or a pressure chamber, a plurality of internal metal liquid face probes are arranged in the seal container, the lower ends of the internal metal liquid face probes are distributed in the seal container according to the certain height difference, each internal metal liquid face probe is electrically connected with a feedback signal receiving device, the multiple internal metal liquid face probes are used for monitoring the height of the alloy melt liquid face height in the seal container, and the casting speed of the alloy melt can be obtained through calculation. Whether the casting speed is too high or too slow is judged, and therefore whether the problem appears in the device or not and whether in the casting process, the alloy melt generates air entrapment or oxide inclusion and other problems or not are judged, and finding and solution of the problems in the casting process are facilitated.