The invention provides a display panel, a control method thereof and a display device. The display panel comprises a control module, a first base plate, a second base plate and a solution, wherein thefirst base plate and the second base plate are oppositely arranged, and the position between the first base plate and the second base plate is filled with the solution; the solution comprises transparent and uncharged liquid and opaque and charged particles; the first base plate comprises a first substrate and a first electrode arranged on the side, close to the solution, of the first substrate,and the first electrode comprises a plurality of discrete sub-electrodes; and the second base plate comprises a second substrate and a second electrode arranged on the side, close to the solution, ofthe second substrate. The control module adjusts an electric field between all the sub-electrodes and the second electrode, the opaque and charged particles in the solution are controlled to make separation and reunion motion, thus the display panel presents a discoloration display effect with multi-stage transparency, and the response time of switching of the multi-stage transparency is about 5 s.