The invention discloses an automatic activation method for a backup battery of a power distribution terminal. The automatic activation method is characterized by comprising a power distribution terminal, an activation control switch, a power supply module and a storage battery, wherein the activation control switch is installed in the power distribution terminal, the activation control switch is connected with the storage battery through the power supply module, a power supply module activation outlet is arranged in the power supply module, the activation outlet in the power supply module is controlled through a central processor in the power distribution terminal, an activation period of the power supply module is set through the central processor, and the storage battery is activated. The activation outlet is arranged in the power supply module, so that the storage battery can be automatically activated through the central processor in the power distribution terminal, and the workload of workers can be alleviated; the automatic activation method has the advantages of simple mechanism, safety and reliability in use and high activation precision.