PURPOSE: A plastic greenhouse having a steel wire arch structure is provided to effectively prevent the collapsing or the destruction of the greenhouse by heavy snow. CONSTITUTION: A plastic greenhouse having a steel wire arch structure includes the following: a supporting frame(10) produced with an H-beam; a curved unit(11-1) curved to an arch shape or a triangular shape; a vertical unit(11-2) vertically installed on the ground from both ends of the curved unit; plural cross direction steel wires(12-1) horizontally connecting arch shaped beams(11) on the top, left, and right sides of an arch shaped beam; plural longitudinal direction steel wires(12-2) combined to the cross direction steel wires, and fixed to the ground; and an arch shaped pipe supporting an arch shaped steel wire(12). The arch shaped beam is supported by a steel wire. The greenhouse additionally includes a fixing unit(22) for a plastic film cover.
