The invention discloses an automatically-telescoping dust removal device used by a stacking 
machine for stacking, and an operation method thereof. The device comprises an 
electrical control device, adust removal device body, a steel 
wire rope and a steel 
wire rope lifting device, wherein the 
electrical control device is connected with the steel 
wire rope lifting device through a 
signal wire; thedust removal device body comprises a 
fixed frame, a framework unit, a telescopic part and a dust removal cover, the telescopic part is arranged on the framework unit, and the dust removal cover sleeves outside the 
fixed frame and is fixed to the framework unit at the bottommost end; and one end of the steel wire 
rope is fixed to the framework unit at the bottommost end through a lock catch, and the other end of the steel wire 
rope is connected with the steel wire 
rope lifting device. According to the device, through the arrangement for a telescopic dustproof cover, the problem of causing 
pollution to environment due to flying dust 
diffusion in a material unloading process is solved, and the working efficiency is increased; and the operation method is rapid and effective, and dust removal 
automation is realized through the feedback of a 
position detector, the control of the 
electrical control device and the driving of the steel wire rope lifting device.