A quantitative dropper structure includes a resilient bottle body, a nozzle detachably sealingly connected to a bottle opening of the bottle body, and a transfer mechanism having a flow path formed of a first transfer pipe, a remaining liquid reservoir and a second transfer pipe. The nozzle has a dispensing orifice and a bottom wall formed with a perforation. The first transfer pipe has a first end communicating with the remaining liquid reservoir and a second end downward extending near to a bottom section of the bottle body. The second transfer pipe has a front end passing through the perforation to communicate with the liquid reservoir and a rear end communicating with the remaining liquid reservoir. When compressed, the liquid flows in the flow path into the liquid reservoir. After a predetermined volume of liquid is contained in the liquid reservoir, the liquid is quantitatively dispensed from the dispensing orifice.