TRUCK BED COVER LOCKING DEVICE, TRUCK BED AND TRUCK

A truck bed cover locking device includes a latch structure and a latch locking component. The latch structure is detachably mounted on a truck bed body. The latch structure includes a limit portion extending toward a latch locking component. The limit portion includes a limit surface and a tilted surface. The tilted surface is located above the limit surface. The tilted surface tilts downward in a direction approaching the latch locking component. The latch locking component is provided on the truck bed cover. The latch locking component includes a retractable plunger and a reset component. The plunger contacts the tilted surface at a point. Under the action of gravity, the plunger is compressed and slides downward. When the plunger slides to a position below the limit surface, at least a part of the plunger stretches out to a position below the limit surface under the action of the reset component.