This utility model relates to a measuring device for the volume and density of small objects by using an electronic balance, with a technical proposal: it includes an electronic balance provided with a weighing supporting body, a string with no need for the electronic balance to support is hung over the supporting body, an openmouthed supporter is connected to the lower end of the string. By using the utility model, the mass of the small object W[object] and the mass of the liquid with a known density drained by its complete submergence W can be measured; using W = F[float]/g, F[float] = Rho [liquid] g V[drained], V[drained] = V[object] = W/Rho[liquid] and Rho [object] = Rho [liquid] W[object]/W can be determined The device has advantages of simple structure, easy operation and high measurement precision.