The invention discloses a building improvement exposed frame glass curtain wall. A vertical beam and a cross beam are connected by a connecting piece, the connecting piece comprises a mounting base plate, and a positioning sleeve is fixed on a building wall through the mounting base plate; two necks are symmetrically formed in the side wall, located on the upper end in the axial direction, of thepositioning sleeve; positioning rods are separately arranged at the two axial ends of the cross beam, and the positioning rods are connected with the positioning sleeve by embedding into the necks; limited blocks are arranged on the end faces of the two axial ends of the vertical beam in a protruding mode, and the limited blocks are inserted into two axial end ports of the positioning sleeve for fixation; in the opposite direction of the building wall, two first mounting grooves are formed in the side face of the vertical beam, second mounting grooves are symmetrically formed in the two edgesof the side surface of the cross beam, and third mounting grooves are formed in the side surface of the positioning sleeve; the peripheral edge portions of a glass composite curtain plate are correspondingly fixed in the first mounting grooves, the second mounting grooves and the third mounting grooves. According to the building improvement exposed frame glass curtain wall, the simplified procedure is facilitated, the rapid positioning and fixing of a keel and the glass curtain plate installation are achieved, and safety hazard is reduced.