The utility model provides a liquid metal electromagnetic pump for pumping the leadfree solder in a braze welding apparatus of a printed circuit board, which is composed of a solder slot, a pump channel, and an electromagnet, wherein the upper part of the solder slot presents a square shape, and the height of a rectangular section of the pump channel is gradually increased along the opening direction. A flow splitting plug is arranged in the middle of the outlet part of a left nozzle, and the outlet part of a right nozzle inclines towards the right side. A vibration preventing column is welded in the active region center of the magnetic field of the pump channel, and an energizing coil is embedded on an iron core column below an open iron core. The defects of weak oxidation resistance, poor wettability of the leadfree solde, etc. are compensated. The reliability and qualified rate of the braze welding products are improved. Under the condition of ensuring the large electromagnetic force and suppressing electromagnetic noise, the utility model has the advantages of simple structure and easy fabrication and simultaneously improves heat dissipation conditions of the energizing coil.