The invention provides a wooden louvre embossing device. The device comprises a conveying belt. A straightening unit, an embossing unit and a cooling unit are arranged on the conveying belt in the operating direction in sequence. The straightening unit comprises a straightening roll. The straightening roll comprises more than three straight rotating roll bodies which are arranged in parallel. Therotating roll bodies are of an up-down two-layer structure. A clearance is reserved between the rotating roll bodies on the upper layer and the rotating roll bodies on the lower layer. A wooden louvrepasses through the clearance. The embossing unit is arranged in the middle of the conveying belt and specifically comprises an embossing main roll and an embossing layer formed on the surface of theembossing main roll. The embossing layer is formed by bending a metal plate into a cylindrical shape and fixing the metal plate to the exterior of the embossing main roll. A heater is arranged insidethe embossing main roll and comprises cylindrical heating pieces formed inside the embossing main roll. According to the wooden louvre embossing device, wooden louvre blades are straightened firstly through the straightening roll, the straightened wooden louvre blades are then embossed, better and more orderly patterns can be obtained, the product attractiveness is improved, and the quality is improved.