The invention relates to a low-cost on-line reinforcement method of aluminosilicate glass, which comprises the following steps that: a high-temperature spraying device is additionally arranged on an annealing kiln of the glass; when the aluminosilicate glass enters the annealing kiln, the high-temperature spraying device atomizes high-temperature fused salt and uniformly sprays to the surface of the aluminosilicate glass; and the atomized fused salt reacts with the glass rapidly to form a compressive stress layer, so that a reinforcement effect is obtained after the aluminosilicate glass is annealed. The designed on-line reinforcement method of the glass is wide in application scope; the existing glass production technology is not required to be modified to a great extent; the investment cost is lowered; and at the same time, the on-line reinforcement method is lower in working temperature and greatly reduces raw material and energy consumption.