The net throwing device contains sleeve (1) with stop end, net ejecting means (2) from sleeve channel (1), folded net (3) and means for opening the net after its ejection from sleeve channel (1), including may weights (7) for opening net (3) attached to it around the periphery. Means for opening the net also contains closing plug (4) placed in sleeve channel (1) between net ejecting means (2) and folded net (3). Weights (7) are installed in many sockets of closing plug (4) made according to the number of weights (7). Closing plug (4) contains means for simultaneous ejection of all weights (7) from closing plug sockets (4) in radial directions outside the sleeve channel (1).