The development of Real time error compensation controller can detect and identify the temperature field of five axis machine tool with double turntable by using temperature sensor.It can also measure the thermal error of the tool in the directions of X, Y and Z relative to the worktable by the displacement sensor. The communication interface between compensation controller and CNC system of machine tool is established by using the developed communication interface system of machine tool displacement. So the displacement signal of the machine tool can be transmitted to the compensation controller in real time and the temperature sensor for compensation is installed at the established sensitive heat source point.The connection between temperature sensor and compensation controller is established by the temperature acquisition system. The temperature signal is introduced into the compensation controller, which can measure the temperature of machine tool and thermal error of spindle in three directions manually and automatically. Compared the measured data with the model output, the residual error of prediction model is small. The compensation effect is better.