The invention discloses a curtain wall for constructional engineering. The curtain wall comprises a base, a collecting device is arranged in the middle of the upper end of the base, a frame is fixedly installed at the upper end of the base, the curtain wall is fixedly installed on the upper part of an inner cavity of the frame, a sliding groove is formed in the left wall of the inner cavity of the frame, a sliding cleaning device is arranged on the groove wall of the sliding groove, a plurality of groups of through holes are formed in the front part of the upper end of the frame, a water collecting device is arranged at the rear part of the upper end of the frame, a telescopic blocking device is arranged on the upper part of the front end of the frame, and an expansion extrusion device is arranged at the upper end of the frame. According to the curtain wall for constructional engineering, a heat conduction box absorbs solar heat and conducts the solar heat to a plastic block, the plastic block has a heat expansion and cold contraction effect, when the plastic block is heated and is in an expansion state, an extrusion plate is driven to move downwards to enter a water collecting groove, water is extruded, the flowing speed of the water is increased, so that the water can rapidly drive heat, and the heat insulation and cooling effects are improved.