This invention relates to a spinning machine accessory, in fact, which is a driver used in yarn splicer. According to the design scheme provided by the invention, it comprises the following structure:left and right cylinders underneath the shell, each cylinder having a piston which can move in the cylinder, a drive axle mounted on the shell in its upper cavity, a single-stage drive pulley mountedon the drive axle, the single-stage drive pulley connected respectively with pistons of left, right cylinders. Without using electric power, the invention avoids potential safety hazard of electricity consumption, improving operational reliability and stability and extending the scope of application.