The invention discloses an auxiliary lamp bead surrounding structure of an underground lamp. The structure comprises a lamp shell (1). An outer ring (11) is arranged on the surface of the lamp shell (1). Annular auxiliary lamp holes (12) are formed in the outer ring (11). An auxiliary lamp base (13) connected with an LED power supply (4) is arranged at the upper portion of the auxiliary lamp holes (12) and fixed to the auxiliary lamp holes (12) through a thread. A spring (14) is arranged below the auxiliary lamp base (13). A cover (15) is further arranged on the surface of the auxiliary lamp holes (12). The lamp bead is quite convenient to disassemble, and good in waterproof performance; meanwhile, a circle of annular auxiliary lamps are further arranged on the periphery of the main lamp, so that the illumination effect is improved, and the decorative effect is improved.