The invention relates to a thermostatic protector for an electrochemical sensor. The thermostatic protector comprises a shell, an intake pipe, an exhaust pipe, and a resistance wire. The intake pipe and the exhaust pipe are communicated with the shell. The resistance wire is wound outside the shell. The shell is a cavity member formed by screwing a base with a top cover. The base is covered with an insulation sleeve. The resistance wire is wound on the outer wall of the base. The base is provided with an air inlet and an air outlet inside. The intake pipe is wound outside the resistance wire and is then communicated with the air inlet. The exhaust pipe is communicated with the air outlet. An outer port of the intake pipe and an outer port of the exhaust pipe extend out of the insulation sleeve. The thermostatic protector is suitable for operational application of electrochemical sensors in portable instruments or online monitor equipment at various gas ambient temperatures. A thermostatic measuring system of the electrochemical sensor has low requirement on operating power supply, current signals are processed into 4-20mA standard signals through a circuit so as to be output, the thermostatic protector can be directly integrated to gas detection instruments and equipment for data exchange, the influence of temperature upon the electrochemical sensors is eliminated to the maximum extent, and measurement accuracy is increased effectively.