The invention provides a Fe-based amorphous alloy with high stability. The chemical formula of the Fe-based amorphous alloy is FeaNibCrcModPeCfBgSihNi, wherein a, b, c, d, e, f, g, h and i represent atomic percentage, and the sum of a, b, c, d, e, f, g, h and i is 100, b is larger than or equal to 2 and smaller than or equal to 4, c is larger than or equal to 8 and smaller than or equal to 16, d is larger than or equal to 10 and smaller than or equal to 16, e is larger than or equal to 9 and smaller than or equal to 14, f is larger than or equal to 3 and smaller than or equal to 8, g is largerthan or equal to 2 and smaller than or equal to 5, h is larger than or equal to 1 and smaller than or equal to 4, i is larger than 0 and smaller than or equal to 5, and the balance of Fe. A cast ingot is obtained by smelting in the ratio of the chemical formula and is subjected to vacuum spray cooling, and the powder of the Fe-based amorphous alloy is obtained. The powder of the alloy is sprayedon a substrate with a hypersonic flame spraying technology, and the coating of the Fe-based amorphous alloy is obtained. The coating has a completely amorphous structure and high stability, and the high stability includes high heat resistance, high oxidation resistance and high passive film stability.