The invention discloses an automatic tracking type solar water purifier based on photosensitive resistance. The automatic tracking type solar water purifier comprises a purifying box and a solar heat collector, wherein the solar heat collector is arranged above the purifying box by an intelligent tracking device and comprises a square frame; and a plurality of parallel hot-water pipes are arranged on the upper plane of the frame, and are solar pipes; and the adjacent hot-water pipes are communicated by three connecting pipes in the horizontal direction. The automatic tracking type solar water purifier disclosed by the invention has the advantages that water is evaporated and heated by utilizing solar energy, so that the electric energy used by water evaporation and purification is greatly reduced; and the solar intelligent tracking device is arranged and can detect the light intensity by the photosensitive resistance, the facing direction of the solar heat collector is controlled by a motor, a lead screw and a semicircular gear, so that the solar heat collector can face the sun all the time, and the working efficiency of the solar heat collector can be improved at maximum.