The rotary table with high precision is an important indispensable part of numercial control (NC) machine tool, and a rotary table with a fixed angle translocation of 180° is needed in some occasions. A gearrack transmission rotary table eliminating clearance automatically was designed driven by hydraulic cylinder. The main parts included in the table were working table, machine box, uplift drive mechanism, slewing drive mechanism, and eliminating clearance mechanism, and etc. The fixed angle translocation was realized eliminating clearance automatically. It can obtain large transmitted torque with simple mechanism and high transmission precision.