Abstract: Disclosed is a secure open showcase for products suitable for display in a hanging manner, including a plurality of fixed back panels sequentially connected together to form a display cylinder, a plurality of windowed panels mounted before the fixed back panels slidably received in two lateral rail-like longitudinal sides of the fixed back panels, upper and lower end covers closing a top and a bottom of the display cylinder, and a supporting stand having a shaft portion extending through the display cylinder to rotatably support the same thereon. Hangers are provided on a front surface of each fixed back panel for hanging products thereon for display. Sliding aids are also provided on the front surface of each fixed back panel to facilitate the sliding of the windowed panel relative to a corresponding fixed back panel along the side rails thereof.