In this study, the steady magnetic and electric fields are coupled in the laser remanufacturing process to generate the directional Lorentz force to study the influence of electromagnetic field on the pore regulation in the laser remanufactured V-groove. The influences of the laser power and electromagnetic field parameters on the porosity of narrow V-grooves are studied using laser remanufacturing experiments. Results show that when the laser power is less than 1400 W, the boundaries between the original part and the added material are prone to poor fusion, and a large number of pores exist in the repaired area. With the increase of the magnetic field intensity, the poor fusion at the bottom of the V-groove is controlled, and the porosity in the repair area gradually decreases. When the magnetic induction is increased to 1200 mT, the porosity of the repair area decreases to 0.006%, and almost no porosity and poor fusion defects appear in the repair area. The downward Lorentz force provided by steady magnetic and electrical fields drives the metal melt to fill downward and accelerate the escape of the bubbles by the eletromagnetic squeezing force, finally obtaining a dense repair area.