The invention discloses a light inspection fixture for a powder-liquid double-cavity infusion bag. The fixture comprises tail positioning pins, a support, an oral tube fixing frame. The tail positioning pins and the oral tube fixing frame are arranged on the front side of the support and at the two ends of the support respectively. The fixture further comprises a reversing sliding block set arranged on the back side of the support. According to the light inspection fixture for the powder-liquid double-cavity infusion bag, the fixture can be matched with a main rail and an auxiliary rail of an overturning device by arranging the reversing sliding block set, and the operation that the fixture is gradually adjusted from the horizontal direction to the vertical direction or from the vertical direction to the horizontal direction is stably implemented.