Method and device for automatically controlling output of power amplifier

The invention discloses a method for automatically controlling output of a power amplifier. The method comprises the following steps: measuring and calculating first associated data between output frequency and gain control voltage and storing the first associated data, and measuring and calculating second associated data between output power and temperature and storing the second associated data; searching in the first associated data and the second associated data in sequence according to the target output power and the target output frequency, and performing power amplifier output according to the initial gain control voltage determined by searching; periodically measuring the current actual output power, and calculating the current difference between the current actual output power and the target output power; when the current difference value is out of the tolerance range, after the target output power is reduced, carrying out searching in the first associated data and the second associated data in seque