The invention provides a high-precision temperature checking method and an instrument based on ARM, which relate to the technical filed of temperature metering and detection. The invention adopts a proportion-fuzzy self regulation PID control method, so the problems of low precision and stability, poor anti-jamming capability and the like during the temperature control of the existing industrial electric heating furnace are solved. The method of the invention mainly comprises the following steps: setting the temperature; detecting the actual temperature to obtain the temperature difference; and carrying out the proportion-fuzzy self regulation PID control external heating on the basis of the temperature difference. The proportion-fuzzy self regulation PID control part is completed by a hardware platform, and the hardware platform is transplanted with a Linux 2.6 operation system, has developed software and is based on ARM 9. The invention is particularly applicable to lagging and non-overload systems and industrial temperature control systems with the requirements of high precision and high stability.