A double-power-supply automatic switching alarm circuit of a solar street lamp provided by the utility model belongs to the technical field of a solar street lamp. The utility model settles a technical problem of providing the solar street lamp control circuit which can realize double-power-supply automatic switching and has low fabrication cost. The double-power-supply automatic switching alarm circuit provided by the utility model is characterized by comprising the components of: a photovoltaic solar cell panel, a photovoltaic controller, a storage battery, an inverter, a first solid-state relay, a second solid-state relay, an AC contactor, a fuse, a time relay, photosensitive switches K1 and K2, a street lamp L1 and an alarm lamp L2. The double-power-supply automatic switching alarm circuit of the solar street lamp is suitable for the field of solar street lamps.