The utility model discloses a safe type thing flow box, including thing flow box body and the pin joint case lid on it, this body include the bottom plate and from this bottom plate extend up and with this bottom plate limit jointly an accommodation space around the wall, the top that should center on the wall be equipped with the pin joint piece, one side of the relative pin joint piece of case lid be equipped with with this pin joint piece assorted pin joint axle, two into the symmetry are established to the case lid, corresponding both sides limit is equipped with prolongs living trapezoidal lock piece to the other side's case lid, corresponding case lid department be equipped with with this lock piece assorted lock groove, the one side in the relative lock groove of lock piece is equipped with the thorn batt, one side of the relative lock piece in lock groove is equipped with former batt, no matter which piece case lid puts down earlier, lock piece homoenergetic on another case lid falls into on the lock groove on the case lid that puts down earlier, and through the cooperation of former batt with the thorn batt, can make the case lid to adhere mutually, and if open the case lid, what also only needs a little hard can be convenient opens, the safe effect of depositing article has been realized.