A collapsible canopy that is expandable during rain fall. The canopy includes a frame, a propulsive mechanism and a shelter. The frame has a stationary side and a movable side. The stationary side is fixed to ground. The movable side is opposite to the stationary side and is configured to move forward and backward in a predetermined path, which expands the coverage of the collapsible canopy. The propulsive mechanism drives the movable side to expand the frame. The shelter is expandable and collapsibly connected to the frame, wherein the shelter forms a collective area to provide sheltering from exterior weather conditions and guides the fluid out when the shelter is expanded and driven by the movable side of the frame.