Drilling fluid cleaners are secondary and tertiary solids control devices in the mud purification system to further separate the smaller solids contained in the shaker treated mud for mud to move to the next stage of separation equipment. Drilling fluid cleaner is made of desander, desander, vibrating screen combination, also known as desanding desanding machine in mud solid control system and vibrating screen as cooperation, separation of 15μm-75μm solid particles, recovered drilling fluid can be used directly or by drilling fluid centrifuge to do further purification use.