The utility model relates to a static pressure detector of a low-speed aerostat, which is used for the static pressure collection of the air of an aircraft that flies with low speed and low height. The static pressure detector comprises an oversheath tube, a forward tube, a pressure leading tube and a buffer air storing chamber. The forward tube is provided in the oversheath tube; the pressure leading tube is coaxially provided in the forward tube; and one end of the pressure leading tube extends outwards. The middle part of the pressure leading tube is uniformly distributed with more than twostatic pressure air leading holes; and the extending-out end of the pressure leading tube is connected with the air inlet of the buffer air storing chamber. The tail end of the pressure leading tubebelow the static pressure air-leading tube is provided with an electric heating tube. The detector adopts a special pressure measuring mode and a dirt removing deicing technique. The static pressure measuring error generated by the measuring of a standard Pitot-static tube, etc. is effectively prevented. The using safety of the aerostat which uses the static pressure of atmosphere as the referencesource of the pressure difference of air bag.