Dead zone warning and indicating device for automobile outside rearview mirror

The invention discloses a dead zone warning and indicating device for an automobile outside rearview mirror. A mirror supporting plate (5) is provided with an installation cavity (5.1) for containing a light source assembly and a light guide plate (3). A plurality of wedge-shaped bosses which are distributed along the Y-axis are arranged on the light guide plate (3) in parallel. One side of each wedge-shaped boss is provided with a flat straight end face (3.4) used for being matched with a corresponding LED lamp bead (6). The upper end faces of every two adjacent wedge-shaped bosses are each provided with an upwards-protruding arc surface I with radius R1. The upper end face of the wedge-shaped boss on the outmost side is composed of a flat straight face (3.5) and an upwards-protruding arc surface II with radius R2. R2 is larger than R1. The dead zone warning and indicating device is more reasonable in structural design, light emitted by LEDs passes through the light guide plate and is then reflected to a set angle, a warning lamp should be bright enough from the view of a driver and should be dark enough at other angles, and the warning effect is better.