The invention relates to an amorphous alloy crystallizer. The crystallizer comprises a copper bush and a rotating core, the copper bush is provided with an outer annular groove, a first inner annular groove and a second inner annular groove, and an annular boss is formed between the first inner annular groove and the second inner annular groove. The rotating core comprises a rotating main shaft and a supporting part which are integrally formed, and an axial inlet and an axial outlet are formed in the center of the rotating main shaft; the supporting part is provided with a water inlet channel, a first water outlet channel, a second water outlet channel, a third water outlet channel and an annular groove, the annular groove and the annular boss form a first cooling cavity, the annular groove and the first inner annular groove form a second cooling cavity, and the annular groove and the second inner annular groove form a third cooling cavity. Cooling water forms cooling water cycles in the crystallizer to cool liquid steel to be cooled in the outer annular groove. Due to the adoption of the structure that the outer annular groove is formed in the amorphous alloy crystallizer, the cooling water in the cooling cavities can cool the liquid steel in the outer annular groove to the maximum; due to the adoption of the two cooling cycle water paths, the rate of cooling the liquid steel to be cooled is improved.