The water-soluble inorganic quenching liquid was used as the quenching medium of the spiral spike. The spiral spike was quenched, tempered at different tempering time and temperature respectively. The microstructure, hardness and minimum physical tension of the spiral spike after different processing were analyzed. The results show that no quenching crack is found on the surface of spiral spike under the condition of quenching temperature 850 ℃ and holding time 80min, and the overall hardenability is good, and the hardness and quenching microstructure have no obvious difference. At the same tempering temperature, with the increase of tempering time, the hardness of spiral spike decreases, and the minimum physical tension decreases. Under the same tempering time, with the increase of tempering temperature, the hardness of spiral spike decreases, and the minimum physical tension decreases. When water-soluble inorganic quenching liquid (concentration 12%) is used as the quenching medium, the appropriate heat treatment process for spiral spike is quenching temperature 850℃, holding time 80min, tempering temperature 460℃, and tempering time 120min.