The invention relates to a biological pest control device comprising a cover (1) coupled above a capsule (b) containing beneficial insects or substances that assist in pest control, with a cavity (C) being defined between the cover (1) and the outer upper surface of the capsule (b), which cavity can house an element used to hang the biological control device. The device is suitable for use in agricultural and/or forest production and it can be supported on the branch of a tree or on an existing natural or artificial linear support. The proposed structure allows the device to be firmly secured to the support, with a lower centre of gravity, thereby protecting the beneficial insects or substances contained therein from rain and wind of any speed and from any direction.
