The invention relates to the field of bridge maintenance equipment, in particular to a bridge cleaning machineshop truck and an implementation method. The bridge cleaning machineshop truck comprises amachineshop truck body, a carriage, a first linear displacement mechanism, a second linear displacement mechanism, a third linear displacement mechanism, a telescopic seam cleaning mechanism, a dedusting mechanism, a positioning mechanism, a storage battery and a controller, wherein the carriage is fixedly connected with the machineshop truck body; the first linear displacement mechanism is fixedly mounted on the outer wall of the rear side of the carriage; the second linear displacement mechanism is fixedly mounted on the movable part of the first linear displacement mechanism; the third linear displacement mechanism is fixedly mounted on the movable part of the second linear displacement mechanism; the moving direction of the movable part of the third linear displacement mechanism is consistent with that of the movable part of the first linear displacement mechanism; and the telescopic seam cleaning mechanism is fixedly mounted on the movable part of the third linear displacement mechanism. According to the scheme, multiple impurities in a bridge telescopic seam are automatically cleaned to save the human cost, the cleaning effect is thorough, the working efficiency is high, thecruising ability is high, and the safety is high.