The invention discloses a sand and dust collecting device which comprises a collecting box, an
air channel opening is formed in the top end of the collecting box, a lower ventilation
pipe is arranged at the top end of the collecting box, the bottom end of the lower ventilation
pipe communicates with the
air channel opening, an upper ventilation
pipe is detachably connected to the top end of the lower ventilation pipe, and a bearing is arranged at the top end of the upper ventilation pipe; the upper ventilation pipe and the lower ventilation pipe are each provided with a fixing pull wire, a
settling chamber is arranged in the collecting box, an air duct opening corresponds to the
settling chamber, and a sand and dust collecting mechanism is arranged in the collecting box and corresponds to the
settling chamber. According to the invention, sand and dust data of more than PM2.5 can be collected, the blank that the existing sand collecting equipment can collect sand and cannot collect dust in the
sand storm earth surface process is filled up, the defects of less sand and dust collection amount, short
observation time and the like of TSP can be made up, and the sand and dust collection efficiency is improved.