A guy wire anchoring device is provided which can be used to hold a tower in place. The device features a container which has a plurality of solid side panels, which are connected to two adjacent side panels using a side hinge mechanism. As a result, the container can be reversably moved from an essentially flat, folded orientation, to an expanded empty container orientation when un-folded. The container also includes at least one base plate which is hingeably mounted to the lower edge of at least one side panel of the container, and which can be moved to a position wherein it at least partially closes the opening at the bottom of said empty container. The container is adapted to be filled with a suitable, local material such as sand, aggregate, or the like, in order to increase the weight of the guy wire anchoring device. The device includes a guy wire anchoring bracket to which guy wires can be attached. The device is easily stored, and can be easily transported to the tower location for use as a guy wire anchoring device.