The invention discloses an Al-Ce-ETM-series aluminum-based amorphous alloy. The Al-Ce-ETM-series aluminum-based amorphous alloy is prepared from the following components in percentage by molar atoms:87 to 89 percent of Al, 7.5 to 8.5 percent of Ce and 3.5 to 4.5 percent of ETM, wherein the ETM is one or a combination of a plurality of Ti, Cr and Mn. The invention also discloses a preparation method of the Al-Ce-ETM-series aluminum-based amorphous alloy. The Al-Ce-ETM-series aluminum-based amorphous alloy prepared by the preparation method has the advantage of strong amorphous forming ability,and has broad application prospect in the field of novel light-weight structural materials; and meanwhile, the Al-Ce-ETM-series aluminum-based amorphous alloy is simple in process, convenient to operate and low in equipment cost, is suitable for industrial production, and has broad market prospect.