The invention relates to a low-temperature electrolyte for a lithium ion battery; the lithium ion battery has excellent low-temperature performance, and the specific discharge capacity at -40 DEG C can reach at least 60% of the specific discharge capacity at 25 DEG C, and even to 73%, and the lithium ion battery disclosed by the invention is obviously superior to the existing lithium ion battery made from commercial low-temperature electrolyte; and the same time, a discharge voltage platform of the lithium ion battery at -40 DEG C is higher than 3.2V, and the highest can reach 3.5V, and voltage platform is also higher than the voltage platform (lower than 3.2V) of the lithium ion battery made of the commercial low-temperature electrolyte. Compared with the traditional electrolyte, the rawmaterial cost required by the low-temperature electrolyte is comparatively low, the preparation is simple, the low-temperature performance is more excellent, the usable temperature range of the manufactured lithium ion battery is wider, so that the low-temperature electrolyte is suitable for power devices on various mobile electronic products, electric vehicles and other mobile communication fieldand the military project field, and is especially suitable for using under the low-temperature environment.