The present invention provides a heat transfer device, an X-ray detecting apparatus and an X-ray imaging equipment. The heat transfer device comprises a first heat transfer loop configured to implement heat transfer with an X-ray detector, a heater configured to heat a heat transfer fluid in the first heat transfer loop, a second heat transfer loop disposed to implement heat transfer with the X-ray detector and a radiator configured to cool the heat transfer fluid in the second heat transfer loop. Hence, heat transfer efficiency can be increased.
