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The invention provides a method for improving the quality of crucian carps. The method comprises the following steps: 1) pond selection and treatment: carrying out disinfection treatment on a pond, laying a later of fine sand and cobblestones at the bottom of the pond, and then laying a layer of straw, corn stalks and wheat stalks; 2) pond water treatment: controlling the pH value of water to be 5-6.5, controlling the water depth to be 70-80cm when fry are thrown, then adding water once every 3-5 days to enable the water depth to reach 130-180cm, wherein 10-15cm of water is added every time, and adding a mixed liquid and discharging water every day in the 1-2 months before crucian carps are sold on the market, wherein the mixed liquid is a filtrate obtained by stewing tea leaves, honeysuckle flowers and pericarpium citri reticulatae and carrying out filtering and cooling; and 3) crucian carp stocking: controlling the stocking density of the crucian carps to be 350-400 kilograms per muand the specification to be 100-120 grams per crucian carp, carrying out stocking on salmon fry at the same time, controlling the stocking density of the salmon fry to be 10-30 kilograms per mu, and carrying out feeding by feed, wherein the feeding amount of the feed accounts for 0.1-0.8% of the total fish weight. According to the method, on the premise that the breeding effects such as the growthperiod of the crucian carps and the like are not changed, the quality of the crucian carps can be remarkably improved, and the survival rate of the crucian carps and the survival rate of the salmonscan be improved.