The invention discloses a display device of a car lamp. The display device comprises a car lamp, a light induction unit, a light driver and a main controller, wherein the light induction unit is provided with a near-distance light collecting inductor and a middle-distance light collecting inductor which induct light sources of coming head lamps in a car lamp outward direction; the near-distance light collecting inductor and the middle-distance light collecting inductor separately induct coming head clamps within different distance areas, so that the main controller accurately judges whether a relative distance is too close or too far, can effectively and accurately control a light-emitting unit to emit warning flash changes which correspond to the relative distance of the corresponding head lamps, and therefore, drivers of coming cars accurately judge the relative distance of the two cars to avoid possible collision; and moreover, the problem of shortsightedness of the single inductor is further improved, and better use and safe benefits are achieved.