Provided is a harmonic suppression method, a corresponding low-noise amplifier (20, 30, 40), and a communication terminal. In the harmonic suppression method, an isolation unit (23, 33, 43) is arranged between a harmonic suppression unit (24, 34, 44) of the low-noise amplifier (20, 30, 40) and an output match network (25, 35, 45)/input match network (21, 31, 41). The harmonic suppression unit (24, 34, 44) is isolated from the output match network (25, 35, 45)/input match network (21, 31, 41) by means of the isolation unit (23, 33, 43), so that the two are not affected or compromised by each other, and can be designed separately. In this way, the design flexibility of a signal amplification circuit is greatly improved, and the design difficulty is reduced.
