A stage lamp glass pattern sheet (1), a stage lamp rotary pattern disc, and a stage lamp optical system. The stage lamp glass pattern sheet (1) comprises a glass layer (2), a light shielding film (3), and a diffuse reflection layer (4), both the light shielding film (3) and the diffuse reflection layer (4) having a hollowed-out pattern. The stage lamp rotary pattern disc comprises a rotary disc (5), several pattern sheet mounting positions (6) provided on the rotary disc (5), stage lamp glass pattern sheets (1) provided in the pattern sheet mounting positions (6), and pattern sheet fixing devices (7) for fixing the stage lamp glass pattern sheets (1) to the pattern sheet mounting positions (6). The stage lamp optical system comprises a light source module (10) and the stage lamp rotary pattern disc. The stage lamp rotary pattern disc can produce multiple pattern effects and the pattern combination of multiple types of stage lamp light, and the color temperature is stable.
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