A front connection device for modular adjustment of drawer slides, the front connection device for modular adjustment comprises a movable base configured to be installed on a drawer, an integrated adjustment module for integrated adjustment of lateral and vertical installation positions of the drawer, and an integrated longitudinal adjustment module for adjusting the longitudinal installation position of the drawer, wherein the integrated longitudinal adjustment module is fastened on the movable base and configured to be positionally connected with the front end of a movable slide, and the integrated adjustment module is slidably installed on the movable base and positionally installed with the movable slide; the integrated adjustment module comprises an integrated main frame, a latch handle component and a vertical adjustment component, the integrated main frame is laterally slidably installed on the movable base and positionally installed with the movable slide, the latch handle component is axially connected to the integrated main frame and rotatably fastened on the movable slide with an axis as a fixed point, and the vertical adjustment component is longitudinally slidably installed on the integrated main frame and provided with an inclined plane which is slidably connected with the bottom surface of the movable slide; the integrated adjustment module is provided with a lateral adjustment component for lateral movement of the movable base under the condition that the positions of connection between the integrated main frame, the vertical adjustment component and the latch handle component with the movable slide are kept unchanged when the drawer is laterally adjusted, the integrated longitudinal adjustment module comprises a longitudinal adjustment base, and the longitudinal adjustment base is provided with a longitudinal adjustment component for longitudinal movement of the drawer under the condition that the positions of connection between the integrated main frame, the vertical adjustment component, the latch handle component and the movable base with the movable slide are kept unchanged when the drawer is longitudinally adjusted, characterized in that the longitudinal adjustment component comprises a longitudinal adjustment wheel and a longitudinal adjustment block with a longitudinal adjustment screw rod, the longitudinal adjustment block is longitudinally slidably installed on the longitudinal adjustment base, the longitudinal adjustment wheel is in threaded connection with the longitudinal adjustment screw rod and drives the longitudinal adjustment block to longitudinally move relative to the longitudinal adjustment base during rotation of the longitudinal adjustment screw rod, and the longitudinal adjustment base is fastened on the movable base. the integrated adjustment module comprises an integrated main frame, a latch handle component and a vertical adjustment component, the integrated main frame is laterally slidably installed on the movable base and positionally installed with the movable slide, the latch handle component is axially connected to the integrated main frame and rotatably fastened on the movable slide with an axis as a fixed point, and the vertical adjustment component is longitudinally slidably installed on the integrated main frame and provided with an inclined plane which is slidably connected with the bottom surface of the movable slide; the integrated adjustment module is provided with a lateral adjustment component for lateral movement of the movable base under the condition that the positions of connection between the integrated main frame, the vertical adjustment component and the latch handle component with the movable slide are kept unchanged when the drawer is laterally adjusted, the integrated longitudinal adjustment module comprises a longitudinal adjustment base, and the longitudinal adjustment base is provided with a longitudinal adjustment component for longitudinal movement of the drawer under the condition that the positions of connection between the integrated main frame, the vertical adjustment component, the latch handle component and the movable base with the movable slide are kept unchanged when the drawer is longitudinally adjusted, characterized in that the longitudinal adjustment component comprises a longitudinal adjustment wheel and a longitudinal adjustment block with a longitudinal adjustment screw rod, the longitudinal adjustment block is longitudinally slidably installed on the longitudinal adjustment base, the longitudinal adjustment wheel is in threaded connection with the longitudinal adjustment screw rod and drives the longitudinal adjustment block to longitudinally move relative to the longitudinal adjustment base during rotation of the longitudinal adjustment screw rod, and the longitudinal adjustment base is fastened on the movable base.