The invention discloses an LNG (liquefied natural gas) cold energy release and gas supply system for a powered fishing craft. The LNG old energy release and gas supply system at least comprises an LNG storage tank, a cold energy absorption heat exchanger, a release heat exchanger, a refrigerating medium storage slot, a low-temperature pump, a fuel temperature-regulating heat exchanger, an engine cooling water slot, a water pump and a fuel machine, wherein a self-supercharger is mounted at one side of the LNG storage tank; an air temperature vaporizer is mounted between the LNG storage tank and the cold energy absorption heat exchanger, and the LNG cold energy absorption heat exchanger, the cold energy release heat exchanger, the refrigerating medium storage slot and the low-temperature pump are connected in sequence and form a closed loop; the LNG cold energy absorption heat exchanger is further connected with the fuel temperature-regulating heat exchanger, and the fuel temperature-regulating heat exchanger, the engine cooling water slot and the water pump are connected in sequence and form a closed loop; the fuel temperature-regulating heat exchanger is further connected with the fuel machine through a fuel pipeline; a flow rate meter is arranged on the fuel pipeline. The LNG cold energy release and gas supply system is reasonable in structural design, high in energy utilization rate, high in safety coefficient, and high in energy utilization value.