The invention discloses a device and a method for top-blowing nickel smelting. The device comprises a furnace body. The furnace body is composed of a side wall, an end wall, a furnace bottom and a furnace top. A partition wall extending into the furnace body is arranged in the middle of the furnace top and divides the furnace body into a smelting zone and a depleted zone which communicate with each other. The portion, located on the furnace top, of the smelting zone is provided with a smelting material inlet, a spray gun port and a smelting flue gas outlet. The side wall upper portion of the smelting zone is provided with a secondary air opening. An end wall, close to the furnace bottom, of the smelting zone is provided with a low-nickel sulfonium outlet. The portion, located on the furnace top, of the depleted zone is provided with a depleted material inlet, an electrode hole and a depleted flue gas outlet. The end wall upper portion of the depleted zone is provided with a depleted slag outlet. A spray gun extends into the smelting zone through the spray gun port. The electrode extends into the depleted zone through the electrode hole. The device overcomes the problem of poor adaptability of a flash smelting raw material, solves the problem of long smelting process flow of an existing molten pool, has strong accident strain capacity, can realize continuous feeding and intermittent discharge, and improves the depleting effect of smelting slag.