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As the main forest firefighting equipment, portable wind extinguisher plays a major role in forest and grassland firefighting. The same as other hand-held vibration machines, portable wind extinguisher inevitably causes hand-transmitted vibration which is an important cause of discomfort for operators, decreased work efficiency, and even health hazards. In this paper, a biomechanical response model of hand-transmitted vibration is established based on the operating posture of the wind fire extinguisher. A standard vibration test platform was set up for the test, and the model parameters were identified through the standard vibration test data. The vibration response predicted by the model is compared with the measured response of portable wind extinguisher to verify the feasibility of the model prediction. The vibration response of the standard vibration experiment platform was used to compare the influence of hand force on the hand-transmitted vibration response. The results show that the goodness of fit between the vibration transmissibility response predicted by the arm model and the response measured by the standard vibration test platform is between 75% and 92%, and the goodness of fit between the vibration transmissibility response predicted by the arm model and the response measured by the portable wind fire machine is within the range of 77%. The research in this article can provides theory and data basis for improvement of vibration reduction protection strategy and device of portable pneumatic extinguisher.