Abstract: In view of the problems that the existing spray pump of the shearer negative pressure secondary dust suppression system used in a mine in Shanxi is prone to failure, the stability and reliability of the water make-up system is poor, and the nozzle is prone to serious blockage, transformation was focused on these problems based on the application condition of the shearer negative pressure secondary dust suppression system in this article. The 3SP60-15/4.8 high-pressure pump was used as the water source power for the secondary dust suppression, which solved the problem of frequent failure of the spray pump. Through the automatic and intelligent transformation of the water make-up system, the spray dust suppression system realized automatic water make-up. The spray area of the dust suppression system has been increased through the modification of the nozzle of the dust precipitator, and the sector has reached the standard. After comprehensive renovation of the above three items, the dust reduction effect of the negative pressure secondary dust reduction system has achieved quality improvement and efficiency enhancement, and the working environment of the coal mining face has been improved. This renovation practice can provide reference for the renovation of negative pressure secondary dust reduction system in the similar working conditions.