Abstract: In actual production of coal mine underground,the shot lighter may begin to shoot but no sprinkling water which is liable to shoot explosion accident.For the problem,the paper proposed a design scheme of automatic sprinkling water control system before shooting of coal mine based on voltage doubling rectifier circuit controlled by P89LPC932 single-chip microcomputer,and introduced configuration,function,working principle and design of main circuits of the system in details.The actual application of prototype system showed that the system not only meets the demand of no shooting no sprinkling,but also realizes sprinkling locking function according to the total sprinkling set in field,which has strong applicability.