As a kind of carnivorous fish, largemouth bass is of high economic value. When it is farmed, its food habit should be transformed from the living food into artificial diet. The traditional way of feeding domesticating has such problems as low survival rate, cannibalism and heavy workload. To solve these problems, on the basis of the food characteristics of largemouth bass, a device depending on waterflow was developed. Furthermore, the device was optimized under the guidance of the hydrodynamics calculation. The diet is taken into pond by the water current and the diet is evenly distributed on the water surface. In this way, the bass larvae grow at a similar speed, which alleviates the problem that the bigger larvae tend to eat the smaller ones. At the same time, this device can realize automatic feeding in fixed time and places, which is favorable to domesticating the larvae, and reducing labor intensity. Compared with the traditional way of farming, using the device to domesticate larvae will increase the survival rate and reduce the workload, thus significantly improve the economic benefit of farming.