The anti-sag rail structure of the pull-out loading box/sliding bed of the pickup truck according to the present invention disclosed includes: a rail unit spaced apart from the loading box door for opening and closing the vehicle loading box; It is installed on the bottom surface of the loading box and is connected in multiple stages to enable adjustment of the withdrawal length, and some of the multi-stages are supported by the rail part when the pull-out type loading box or sliding bed mounted at the front end is drawn out; include According to the present invention, since it is possible to withdraw the pull-out loading box/sliding bed from the loading box of a vehicle such as a pickup truck while preventing sagging, there is an effect that cargo can be easily loaded and unloaded regardless of the loading box length.
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