Roof rainwater collecting structure

The utility model discloses a roof rainwater collecting structure which comprises a water storage tank, a connecting bin, a filtering drawer, a dirt containing box, a limiting column, a vent pipe and a water pump. The connecting bin is installed on one side of the upper end face of the water storage tank, and a water inlet pipe is installed at the top end of the connecting bin; a water inlet matched with the connecting bin is formed in the position, located below the connecting bin, of the upper end face of the water storage tank, an observation opening is formed in the side face of the water storage tank, scales are pasted on the observation opening, a water outlet pipe is constructed at the bottom end of the side, away from the connecting bin, of the water storage tank, and a filtering drawer is installed in the connecting bin in an inserted mode; a filtering drawer is installed at the bottom end of the water inlet pipe, a handle is installed on the outer side of the filtering drawer, the bottom end of the