The utility model relates to a wide grade mineral floatation device of adjustable flotation height, it can be divided into inflates the part, flotation part, concentrate collecting part. Aerifing thepart and counting including air producer, air mass flow, air producer is used for producing gaseously, adjusts inflation valve control aeration speed, the flotation part includes the psammitolite piston, go up and down axle, flotation column, and the flotation column is introduced from the air inlet to the air, and the psammitolite that is located between air inlet and the flotation column cuts into minute bubbles, and the psammitolite adopts the porous medium that four kinds of pore structures are different, can produce the bubble of different particle diameters. The gear drives the psammitolite piston and rises or descend in order to adjust mineral flotation height, concentrate collecting part includes the overflow launder, scrapes trigger and ore discharge mouth, and flotation foam come-up is assembled in the overflow launder, and the start -up is scraped the trigger and is scraped ore discharge mouth collection concentrate with the flotation foam. Scrape the trigger and pass through the support and fix on the flotation column top, be connected to the motor through the belt on.