The comprehensive performance of rock wool glass produced by the electric melting method of domestic waste incineration fly ash was studied. When the addition amount of fly ash was 50%, the addition amount of feldspar was 30%, the (Al2O3+SiO2) content in the glass was greater than 48%, and the ratio of (Al2O3+SiO2)/(Na2O+K2O) was greater than 3.78, the fly ash glass was most suitable for producing rock wool. At this time, the chemical stability was good, and it had the best acidity coefficient, viscosity coefficient, and hydrogen ion index parameters. The test results of sample showed that the content of the glass body was greater than 99.5%, the acid dissolution rate was 0.11%, and the detection values of harmful substances in water and acid leaching were far below the limits in the national standard. Most of the leaching amounts were in an undetected state. The glass state of sample was good, the material properties were long, and it was easy to melt, making it easy for the centrifuge to spin cotton into shape.