Disclosed is a mechanically stabilized earth (MSE) wall system for preventing collapse of a retaining wall. The MSE wall system includes: at least two pillars installed on a front surface of the retaining wall; a plurality of screens installed on a rear surface of the pillar and arranged along a vertical direction to intercept a space between the adjacent pillars; at least a connector installed between the adjacent pillars to preserve a space between the adjacent pillars and prevent the screens from being separated into a front direction; and at least a front panel spaced from a front surface of the screen. Since deformation of the screen which supports the load of the backfilling soil is not transferred to the front panel, it is possible to provide excellent appearance.