The invention discloses a thermosensitive fe-based amorphous alloy, a preparation method thereof and a magnetic temperature control switch prepared through the alloy. The atomic composition of the alloy is Fe68-xCrxNbyYzBm, wherein x is 0 to 9, y is 2 to 5, z is 3 to 10, m is 16 to 25, and y plus z plus m equals to 32. The preparation method comprises the steps of step I, preparation of a master ingot: converting atomic percent into mass percent, weighing raw materials, putting the raw materials into a high temperature furnace prepared in advance, and carrying out repeated smelting under the existing of a protective gas to prepare the master ingot; and step II, preparation of the thermosensitive fe-based amorphous alloy: taking the master ingot out of the high temperature furnace which iscooled to the room temperature, putting the master ingot into alcohol, cleaning the master ingot through ultrasonic waves, crushing the master ingot into blocks, and then, preparing the fe-based amorphous alloy through a copper mold casting method. According to thermosensitive fe-based amorphous alloy, the preparation method thereof and the magnetic temperature control switch prepared through thealloy, precision, performance stability, reliability, durability and energy conservation performance of the temperature control switch are greatly improved.