Assembly structure of floor insertion bottom box

An assembling structure of a floor insertion bottom box comprises a bottom box and an outer frame which are connected with each other, and hook assemblies, the hook assemblies are installed on the two sides of the bottom box through clamping parts, each hook assembly comprises a hook, a fastener and a support seat, the hooks and the fasteners are installed on the support seat after being connected in a matched mode, and first limiting parts are arranged between the fasteners and the support seat. A first limiting portion is arranged between the hook and the support seat, a second limiting portion is arranged between the hook and the support seat, the fastener is axially limited on the support seat through the first limiting portion and the second limiting portion, a tool acts on the fastener so that the hook can axially move along the fastener, and when the hook moves to the corresponding position, the hook and the outer frame clamp the movable floor. The detachable hook assemblies are arranged on the two sid