The invention provides a heat exchanger air quantity matching method of a variable-frequency air conditioner. The method includes that when air quantity of an indoor unit heat exchanger in rated refrigerating condition is X, air quantity of the indoor unit heat exchanger in intermediate refrigerating condition is set as (0.8-0.95)X, air quantity in rated heating condition is set as (1.2-1.6)X, and air quantity in intermediate heating condition is set as (1.0-1.4)X; and/or when air quantity of an outdoor unit heat exchanger in rated refrigerating condition is Y, air quantity of the outdoor unit heat exchanger in intermediate refrigerating condition is set as (0.6-0.85)X, air quantity in rated heating condition is set as (0.7-1.0)Y, and air quantity in intermediate heating condition is set as (0.4-.0.7)Y. indoor unit air quantity and outdoor unit air quantity when the air conditioner is in the intermediate refrigerating condition, the rated heating condition and the intermediate heating condition are optimized and adjusted, the air quantity of the indoor and outdoor heat exchangers of the air conditioner is close to optimized air quantity, the air conditioner can run with efficiency close to the highest efficiency, and noise is low.