An online thickness detection platform, including: a main frame having a first beam and a second beam extending in a first horizontal direction and opposite to each other in a vertical direction perpendicular to the first horizontal direction; a C-typed frame slidably mounted on the main frame and having a first arm and a second arm extending in the first horizontal direction and opposite to each other in the vertical direction; a first laser sensor and a second laser sensor mounted on the first arm and the second arm of the C-typed frame, respectively; and a driving mechanism mounted on the main frame and adapted to drive the C-typed frame to slide back and forth in the first horizontal direction, wherein the first laser sensor and the second laser sensor are configured to detect a thickness of a product passing between the first arm and the second arm and moving in a second horizontal direction perpendicular to the first horizontal direction, wherein the first laser sensor and the second laser sensor do not contact the product during detecting the thickness of the product. In the present disclosure, since the thickness of the product may be detected online by the online thickness detection platform, the thickness of the product may be monitored in real-time. Once the thickness of the product exceeds an allowed value range, it may alarm and stop production of the product in time. Thereby, it may avoid producing a large number of unqualified products with a thickness out of the allowed value range and waste is prevented.