The invention relates to a surface-mounted transformer magnetic core for a liquid crystal display, comprising an I-shaped magnetic core and a C-shaped magnetic core, wherein the I-shaped magnetic core is a cuboid, the C-shaped magnetic core is in a C shape, and the right side of the surface-mounted transformer magnetic core is provided with a bulge. Compared with the prior art, the surface-mounted transformer magnetic core has relatively simple structure and shape, large radiating area, simple manufacturing technology and better electromagnetic performance, is beneficial to surface mount and can be used for manufacturing large-size magnetic cores; the inductive dispersion of the surface-mounted transformer magnetic core is strictly controlled within 10 percent, the leakage inductance consistency is strictly controlled within 3 percent, the power loss requirement is controlled within 60mW/g, and the inductance, the leakage inductance and the power loss are ensured.