The utility model discloses a moped for heavy sealing plate welding. The moped comprises a lower moped plate and an upper moped plate arranged on the lower moped plate. A Z-axis-direction moving control mechanism and an X-axis-direction moving control mechanism are arranged above and below the lower moped plate respectively. A Y-axis-direction moving control mechanism and a blocking plate mechanism are arranged above the upper moped plate. The blocking plate mechanism comprises a bottom plate which is movably arranged on the upper moped plate and a blocking plate fixedly arranged on the bottom plate. An upper packaging plate and a lower packaging plate for fixing placing of sealing plate workpieces are arranged on the blocking plate. An electromagnet is arranged on the lower packaging plate. According to the small moped, heavy sealing plate welding locating accuracy is high, working efficiency is improved, and the labor intensity of workers is lowered.