The invention discloses an LED ceiling lamp which comprises a base plate, a lampshade, an LED bead and a lens mechanism. The lens mechanism is fastened to the base plate, and a closed space is formed by the lens mechanism and the base plate. The LED bead is arranged in the closed space and connected with a circuit board. The LED bead is connected with a driver through the circuit board, wherein the driver drives the LED bead to emit light. The driver is installed on the base plate. The lampshade is fastened to the base plate and located above the lens mechanism. The lens mechanism comprises a circular-ring-shaped lens body. The bottom of the circular-ring-shaped lens body is provided with an annular inner refraction groove which is concentric with the circular-ring-shaped lens body, an outer refraction face is integrally formed on the top of the annular inner refraction groove, the surface of the annular inner refraction groove is a groove concave face, the surface of the outer refraction face is a convex combined face, and the curvature of the annular inner refraction groove is larger than that of the outer refraction face. Optical output at multiple angles can be achieved by applying different curvature designs, the light source configuration of the ceiling lamp is greatly enriched, and the product competitiveness is improved.