The utility model belongs to the technical field of detection and provides a light splitter detecting apparatus used for detecting whether a light splitter is provided with a broken line area. The light splitter detecting apparatus comprises a light-emitting device and an image detecting device. The light-emitting device and the light splitter are arranged oppositely. The light-emitting device is used for irradiating the light splitter with light. The image detecting device is used for acquiring light emitted from the light splitter to form a detecting image, and determining whether the light splitter is provided with the broken line area according the detecting image. Since the light splitter has a light splitting effect, light emitted from the light-emitting device is emitted outwardly by the light splitter. The image detecting device acquires the light emitted from the light splitter to form the detecting image and processes the detecting image in order to determine whether the light splitter is provided with the broken line area. Thus, more reliable detection is achieved. The utility model also provides a light splitter detecting method with visualized detection and high detection efficiency.