Photogrammetry device with anti-crash protection

The invention discloses a photogrammetry device with anti-crash protection, and relates to the field of photographic equipment, the photogrammetry device comprises an unmanned aerial vehicle and a camera, the top of the unmanned aerial vehicle is provided with a protective shell, the protective shell is internally provided with a light gas tank, the top of the light gas tank is fixedly provided with a gas outlet pipe and a gas filling pipe, and the gas outlet pipe is internally provided with an electromagnetic valve; and a controller and an operation monitor are further fixedly arranged at the top of the light gas tank. When the unmanned aerial vehicle falls, an operation monitor can monitor the change of the flight state of the unmanned aerial vehicle, then a signal is transmitted to a controller, the controller can control an electromagnetic valve in an air outlet pipe to be opened, gas in a light gas tank can instantly enter an elastic air bag, the elastic air bag is gradually expanded, and then the unmann