The invention discloses a fusing type spot position feedback device and method and is intended to feed back a spot position deviation by means of metal fusion upon heating, with stable and precise spot position feedback. A technical scheme used by the device refers to the device, comprising a thermal barrier (1), the thermal barrier (1) is provided with spot holes (2), when a sunlight tracing system of a disc photothermal generating set traces sunlight normally, all spots reflected by a disc reflector run through the spot holes (2), the thermal barrier (1) is provided with a metal coil (3), two ends of the metal coil (3) are connected respectively to the sunlight tracing system, a voltage is applied to the metal coil (3) through the sunlight tracing system, and when the sunlight tracing system of the disc photothermal generating set has a deviation during sunlight tracing, spots reflected by the disc reflector irradiate to the metal coil (3) so that the metal coil fuses off.