Relating to the technical field of swimming pool heating reactor fuel operation, the invention specifically discloses a swimming pool atmospheric pressure and low temperature heating reactor fuel handling system and method. In the system, a refueling machine can move arbitrarily between a reactor core pool and a spent fuel pool in connection; an underwater auxiliary loading and unloading platformis installed on an overhaul platform above the reactor core pool, and the refueling machine can perform loading and unloading operation of fuel in the reactor core pool area through the auxiliary loading and unloading machine. The system and method can achieve precise grabbing of a fuel assembly at any position, complete enveloping of the fuel assembly in a fixed sleeve, and transshipment to a spent fuel assembly storage framework. The system and method ensure the staff, fuel assemblies and equipment safe and controllable and the technology feasible in the loading and unloading process; relative to pressurized water reactor nuclear power station fuel handling and storage equipment, under the premise of meeting the function and performance requirements of deepwater refuelling operation, allthe refuelling related equipment involved in the invention is simpler, the realizable technology maturity is high, and the cost advantage is strong.