The invention discloses an automatic control power switch used outdoors. The power switch comprises a box, a storage battery, an insulation post I, a circuit, insulation nuts, conductive pieces, a memory alloy, an insulation post II, a central shaft, a roller, a scraper, a motor, a support and a solar cell panel, wherein the insulation post I and the insulation post II which are integrated are arranged in the box, the insulation nuts are arranged at top ends of the insulation post I and the insulation post II, the conductive piece clamped between two insulation nuts on the insulation post I is connected with the memory alloy, the memory alloy is also attached to the conductive piece at the top end of the insulation post II, the support is arranged in the box, the central shaft is placed on the support and sleeved with the roller, the scraper is arranged on the roller, one end of the central shaft is connected with the motor, and the motor is connected with the storage battery through a lead. The automatic control power switch used outdoors can connect and disconnect a line automatically and adjust connection and disconnection time of the line as required.