The invention relates to a pressing device comprising an upper pressing module and a lower pressing module. The upper pressing module and the lower pressing module are mutually buckled to form a pressing space; the upper pressing module comprises a body and a pressing part protruding out of the body; the lower pressing module comprises a seat body and a positioning groove arranged on the seat body; and the bottom surface of the positioning groove is provided with a convex lens module pressing part. The pressing device can simultaneously press the lens module and other parts in place through the lens module pressing part arranged on the lower pressing module, thereby simplifying the pressing process and improving the pressing efficiency. In addition, simultaneous pressing at two sides can avoid the damage of subsequent pressing action on a part assembled and pressed before.