The invention discloses a method for improving the efficiency of a communication power supply system. The method includes the following steps that the currents of a battery pack are collected through an AD conversion module, and it is judged that batteries are in a floating charge state; the actual output currents of a switching power supply module are collected through the AD conversion module to obtain the maximal theoretical output current of the switching power supply module, and the current load rate of the power supply system is obtained through calculation; the number of modules needing to be started at present is calculated, and after time is delayed for a while, the system enters in an alternate resting state; a monitoring module issues an instruction to a control module switch, the module starting number is adjusted to be equal to the number of the modules needing to be started, which is obtained through calculation in the third step, and delay is started; when the delay time arrives, a new module is started, then an original module is shut down, new delay is started, the load rate can be calculated in real time, and the number of the modules needing to be started is calculated again. The purpose of lowering communication power supply energy consumption is achieved.