A wind curtain machine casing adopts the way of the combination casing structure of plastic-metal elements, saves lots of matching element installation procedures, working time and materials in the wind curtain machine production process through integrating peripheral edge covers, wind wheel bearing bush bracket, a movable wind guide grid bracket assembly and a front wind shield fixing device on a plastic lateral plate, corresponds to left an operable working open lap for enclosing a metal panel finally through the structure of producing an infolding step horizontal corded clump on the front edge cover of the plastic lateral plate, producing an infolding step clump on a top plate, and producing thread fixture hole on the lower clump of the front wind shield, thereby providing conveniences for assembling continuously various inner components of the wind curtain machine after the plastic lateral plate and a metal chassis are connected. The plastic lateral plate-metal element combination casing structure has the comprehensive advantages of low production cost and high efficiency, which is adopted in various wind curtain machines.