The invention discloses an atomization production method for ultralow-apparent-density copper powder, which comprises the following steps: 1, finding a proper low-temperature water source; 2, increasing multiple coolers to reduce the temperature of circulating water to about 5 DEG C; 3, adding matters with high specific heat capacity such as liquid ammonia into water; and 4, spraying a low-temperature water solution under a high pressure of over 15MPa from a ring spray nozzle to form atomized copper powder. When the method is used, the molten copper forms small molten copper particles under high-pressure impact, the particles solidify quickly, the tension on the surface of a liquid phase is reduced, the molten copper is cooled quickly, the formed powder thus is more irregular than that sprayed out by the conventional atomization method, the apparent density of the powder may reach less than 1.2g/cm<3>, and the porosity of the sintered copper powder reaches over 70 percent.