The utility model discloses a cleaning device is assisted to modulus formula expansion joint rubber groove debris is provided with supplementary cleaning device between the roof beam in roof beam and shaped steel boundary beam or the shaped steel in shaped steel boundary beam or shaped steel, the long clamp of rubber sets up in the recess in the middle of the rubber waterstop, the long opening that presss from both sides of rubber to be provided with the glass fiber stick in inside, the adhesive setting is between the recess of long clamp of rubber and rubber waterstop. The position of glass fiber stick is arranged in rubber groove lower part, flexible along with the rubber waterstop in the use, and rubber is long to be pressed from both sides together flexiblely thereupon, and the removal of by a small margin is done in pressing from both sides in that rubber is long to the glass fiber stick, in clearance rubber groove before the debris, slowly mention the glass fiber stick in pressing from both sides from rubber is long, partly debris can be carry over out of to the glass fiber stick, disturbance simultaneously debris for remain the loose dispersion that becomes of debris in the rubber groove, adopt other measures swift debris of thoroughly cleaing away of just relaxing again, whole supplementary cleaning device simple structure, convenient operation, the cost is lower.