The invention relates to a quantitative liquid taking device which comprises a main cavity, a filling mouth positioned on the upper end or one side of the main cavity, and a sealing cover which is installed on the filling mouth in a matching way, wherein the upper end of the main cavity is also fixed with a measuring cavity; the upper end of the cavity body of the measuring cavity and the bottom of the main cavity is fixedly connected with a communicating pipe; the upper end of the measuring cavity is also provide with a material outlet and a sealing cover which is installed on the material outlet in a matching way; the measuring cavity is divided into N equal parts from the bottom to the top according to the volume; the upper edge of the reticle of each equal part is provided with a through hole; and matched sealing covers are installed on each through hole. In the quantitative liquid taking device, after any through hole which corresponds to different calibrations is communicated with the communicating pipe, equal liquid on the reticle part can be measured and taken. The quantitative liquid taking device has the advantages of convenient, flexible and accurate liquid taking, largely enhances the liquid taking efficiency, is suitable for various fields of industry, agriculture and the like, has simple structure, is easily manufactured or produced, and is extremely beneficial to popularization and implementation.