Due　to　the　safe　portability　of　the　device　in　sixth　generation　(6G)　enabled　network　in　box　(NIB)　and　the　mobility　of　locations,　users　equipped　with　the　device　can　have　a　better　experience　in　spatial　crowdsourcing.　The　integration　of　NIB　with　6G　results　in　a　decentralized　spatial　crowdsourcing　in　industrial　automation,　but　threatens　the　security　of　tasks　and　answers　and　also　leads　to　the　leakage　of　sensing　nodes＇　locations.　To　address　these　problems,　in　this　article,　we　propose　a　secure　decentralized　spatial　crowdsourcing　scheme　for　6G-enabled　NIB　(DSC-NIB).　Using　DSC-NIB,　the　control　station　and　sensing　nodes　can　gather　and　transmit　information　on　the　blockchain　using　NIB,　without　depending　on　the　third　party.　The　control　station　shares　encrypted　location　strategy　parameters　set　to　negotiate　session　keys　and　a　group　key　with　sensing　nodes　whose　locations　satisfy　the　location　strategy,　while　ensuring　the　privacy　of　sensing　nodes＇　locations.　For　the　security　of　tasks　and　answers,　we　leverage　the　Counter　with　CBC-MAC　authenticated　encryption　mechanism　to　provide　confidentiality　and　integrity.　Furthermore,　we　analyze　the　security　of　the　proposed　DSC-NIB.　Compared　with　existing　approaches,　the　performance　is　evaluated　and　improved　by　30--50%.　To　further　optimize　the　performance,　two　optimized　schemes　without　sacrificing　security　are　presented　and　our　results　demonstrate　that　performance　is　improved　greatly.