The invention discloses an adjustable paste box, and belongs to the field of coating method research. The adjustable paste box comprises a shell, material collecting mechanisms, two rubber pads, an adjusting mechanism and two scrapers; the shell is in a cuboid shape, a concave cavity is formed in the top surface of the shell, the shell comprises two identical sub-shells, each sub-shell comprises abottom plate, side plates and two mutual paralleled vertical plates, wherein the side plates and the two vertical plates are vertically arranged on the bottom plate, the side plates are vertically connected with any vertical plate, and a clamping mechanism is arranged between the two vertical plates forming the side faces of the shell; the material collecting mechanisms are arranged inside the shell; the two rubber pads are arranged, the cross sections of the rubber pads are in U shapes, and the two rubber pads are arranged between the two sub-shells; the adjusting mechanism is provided withguide rails and sliding blocks, and the guide rails are fixedly arranged at the top of the shell; and the two scrapers are symmetrically arranged on two sliding blocks, and the scrapers are arranged in parallel with the middle section parts of the rubber pads. The adjustable paste box is simple in structure and convenient to operate, the contact area between paste liquid and a pole piece can be ensured, and then the coating quality of the pole piece is guaranteed.