Solid-control device is widely applied in petroleum drilling and has been implemented in series, standardization and specialization. Geological core drilling is different from oil drilling in depth, diameter and process. The GK-15 mud solid-control device for geological core drilling is developed on the basis of the comprehensive characteristics of solid-control device for petroleum drilling and combined with the requirements of geological core drilling technology, the vibration sieve, cleaner and centrifuge are connected through a pipeline to form a closed mud solid control device to achieve of slurry preparation, circulation, solid control and reserve. The paper introduces the structure and parameters of GK-15 mud solid-control device for and sums up the application conclusion.