In order to realize precision seeding for super rice and other crops in the seedling tray, the ration of quantitative seed supply is one of the important indicators to measure the performance of precision seed meter. Due to the uneven feeding of existing fluted roller seed meter, it needs to discuss quantitative seed supply technology deeply from the theory to test. A quantitative seed supply device with electromagnetic vibration scoop shape fluted roller was designed, including a detail structure design for scoop shape fluted roller, vibrating board and rubber sheet, etc. The theoretical model for quantitative seed supply was built with structure characteristics of the device, and the actual seed supply quantity was tested under the condition that electromagnetic vibration frequency was always constant. It was obtained that the influence rules of actual seed supply quantity were electromagnetic vibrator amplitude and fluted roller rotational speed. The test results showed that the actual seed supply quantity was close to theoretical model, the relative error of quantitative seed supply was less than 4%, when the seed rotational speed of metering wheel was 0.8~6.6r/min and above 6.6r/min, the electromagnetic vibrator amplitude was selected as 10μm and 15μm, respectively. The research results can provide a reference for digital design of precision seed meter.