The utility model provides a dustproof device of a combustible gas detection probe and a combustible gas detector, and relates to combustible gas detection equipment. According to the utility model, the pipe barrel is sleeved on the probe shield; vent holes are formed in the upper end of the pipe barrel; an air inlet is formed in the lower end of the pipe barrel; inner rotating blades which spirally extend are arranged on the inner wall of the pipe barrel; therefore, gas entering the pipe barrel can spirally rise along the internal rotation blades; in the spiral ascending process, the screw rod rotates; the gas generates a rotary scouring effect on the probe shield; the opportunity that combustible gas in the air is in contact with the probe shield is increased; and meanwhile, impurities such as sand and dust blocked on the probe shield can be impacted, so that the blocking problem of the probe shield is greatly reduced or even avoided, the dustproof effect is improved, the interference of the impurities such as sand and dust on reactions such as combustible gas catalytic combustion is avoided, and the detection stability and accuracy of the detection probe are improved.