Traffic signal lamp with optical judgment function

The invention discloses a traffic signal lamp with an optical judgment function. The traffic signal lamp comprises a vertical supporting rod and a horizontal supporting rod. The upper end of the vertical supporting rod is fixedly connected with a horizontal supporting rod; when an optical judgment unit detects that the sunlight ray angle is consistent with the angle at which a driver observes the three-way signal lamp, a signal is sent out, the three-way signal lamp is controlled to flash, then a traction rope and a positioning ring are manually pulled, an external connection block is made to move, and therefore a passive plate and a horizontal plate which are symmetrical are unfolded, and a shading film is tensioned on the rear side of the three-way signal lamp; therefore, sunlight from the rear side cannot directly irradiate into the eyes of a driver, and the driver can clearly see the content of the three-way signal lamp when the sunlight irradiation angle is consistent with the angle of observing the thre