Provided is a ball-type airflow dynamic indicating instrument. The instrument comprises a transparent short pipe, flanges which are installed at the two ends of the transparent short pipe and used for connecting the transparent short pipe into an air pipe and an indicating ball assembly which is installed inside the transparent short pipe and used for indicating the air flowing state and wind direction. The indicating ball assembly comprises two perforated baffles and multiple air balls which are arranged in a space formed by the perforated baffles and the transparent short pipe. The ball-type airflow dynamic indicating instrument is simple in making method, low in cost, free of mechanical transmission part, resistant to corrosion and capable of overcoming the defects in the prior art, effectively solving the problem that the balance performance of tail end gas suction or gas exhaust in a gas collecting and processing or ventilating system is poor, greatly simplifying the difficulties of system debugging and operating maintenance, decreasing the numbers of air valves and flow meters and reducing the manufacturing cost of a pipeline system.