The utility model discloses a pump head replacing tool for a screw pump well. The pump head replacing tool for the screw pump well comprises a first steel wire rope loop, a second steel wire rope loop, a third steel wire rope loop and an euphroe, wherein the first steel wire rope loop is as long as the second steel wire rope loop; the two ends of the third steel wire rope loop are respectively connected with the two ends of the euphroe; the largest length of the third steel wire rope loop is smaller than that of the second steel wire rope loop; one side of each of the first steel wire rope loop, the second steel wire rope loop and the third steel wire rope loop is connected with a lifting hook of a crane in a hanging mode; the other side of the first steel wire rope loop and the other side of the second steel wire rope loop are respectively connected with the two ends of the bottom of a pump head base in a hanging mode; the other side of the third steel wire rope loop is connected with an output shaft of a pump head in a hanging mode. Due to the high strength of the steel wire rope loops, the pump head can be stably hoisted in multi-directions by the three steel wire rope loops, so that the happening probability of pump dropping and getting damage accident is reduced; by the adjustment of the length of the third steel wire rope loop, the deviation degree of the pump head can be adjusted, and the pump head deviation during lowering is avoided.