The invention discloses a marine environment monitoring sampling automatic storage device easy to fix, and belongs to the technical field of seawater detection. The marine environment monitoring sampling automatic storage device easy to fix comprises a fixing plate, a plurality of tooth columns B are linearly and fixedly arranged at the front end of the outer side wall of a side plate at equal intervals, a circular groove is formed in the lower end of the right wall of a cavity, a gear is coaxially arranged in the circular groove, a plurality of tooth grooves are linearly formed in the outer wall of a fixed seat at equal intervals relative to the position of the gear, a rotating shaft is coaxially and fixedly connected to the middle of the top face of the gear, a threaded hole is formed in the middle of the top face of the rotating shaft, a column groove is formed in the position, symmetrical to the rotating shaft, of the left side of the top face of a storage box, a sliding column is inserted into the column groove, and a top plate is fixedly arranged between the upper end of the threaded column and the upper end of the sliding column. According to the device, a worker can store a seawater sample on a ship conveniently, and the device can be fixed and detached more easily and is convenient and rapid.