Abstract: The present invention relates to a vacuum cleaner locking device that is particularly adapted to lock an industrial vacuum cleaner of the type having an upper container and lower container disposed in a stacked relationship wherein each container includes a pair of handles which are aligned with the handles of the other container. The vacuum cleaner locking device includes a pair of L-shaped locking bars having vertical and horizontal sections. Each vertical section extends vertically along one side of the vacuum cleaner and through a respective handle on the upper container and engages a respective handle on the lower container. A hook is formed in the lower end of each vertical section for extending around and underneath the respective lower handles for engaging the same. The horizontal sections extend from the upper end of the vertical section over the top of the upper container to a point where they meet. At this point the ends of the horizontal sections turn upward and abut against each other.