The invention relates to a device for detecting the static pressure of a low-speed aerostat, which is used for collecting static air pressure in a low-speed and low-flying aerostat. The device comprises an outer sleeve, a forward pipe, a pressure guiding pipe and a buffer and air storage chamber. The forward pipe is arranged in the outer sleeve, and the pressure guiding pipe is coaxially arrangedin the forward pipe; one end of the pressure guiding pipe stretches out; the middle part of the pressure guiding pipe is evenly provided with more than two static-pressure air guiding ports; the stretching end of the pressure guiding pipe is connected with an air inlet of the buffer and air storage chamber; and the tail end of the pressure guiding pipe at the lower part of the static-pressure air-entrainment port is provided with an electric heating pipe. The device adopts a special pressure-taking method and a dirt-removing and deicing technology, thereby effectively avoiding the static-pressure measurement error generated by the measurements by a standard pitot static-pressure tube and the like and guaranteeing the safe use of aerostats taking the static pressure of the atmosphere as thepressure difference reference source of airbags.