The invention discloses a sea area non-digenetic and digenetic natural gas hydrate fluidization trial production method. The method comprises the steps that depending on an offshore floating drilling device, a testing well and a sampling well are drilled in a trial production area, the well logging operation is implemented by means of the testing well, and a natural gas hydrate layer position is judged; the offshore floating drilling device is moved to the well position of the sampling well, and after a drill rod is used for drilling to the top of the natural gas hydrate layer position and sampling is performed, fluidization measures are adopted for fluidizing the natural gas hydrate; an ascending channel of fluidized natural gas hydrate-water multi-phase fluid is built by means of the drill rod and an annular channel formed between the drill rod and a continuous oil tube so that the multi-phase fluid can be returned upwards to the offshore floating drilling device for trial sampling or testing. According to the sea area non-digenetic and digenetic natural gas hydrate fluidization trial production method, no expensive deepwater drilling riser, or underwater blowout preventer or underwater Christmas tree or underwater testing tree is adopted, trial production is synchronously implemented by means of sampling, needed facilities are simple, and therefore the good economic benefits are achieved.