A method of cultivating aquatic product and plant contains steps of: (A) Preparing a cultivation tank (10) with cultivation water (12) (B) Aerating the cultivation water (12) (C) Drawing overflow water in a top of the cultivation tank (10) and foul water in a bottom of the cultivation tank (10) into a protein separator (30) and a first ultrafiltration unit (40) (D) Collecting bubbled fluid from the protein separator (30) and concentrated waste fluid from the first ultrafiltration unit (40) into a collection chamber (50) (E) Pumping the cultivation wastewater into a second ultrafiltration unit (60) and filtering the cultivation wastewater by using ultrafiltration films of the second ultrafiltration unit (60) (F) Discharging cloudy high-protein concentration fluid (111) into a first gathering bucket (70) (G) Pumping filtered fluid filtered by the plurality of ultrafiltration films of the second ultrafiltration unit (60) into a Nano-filtration unit and (H) Flowing the recyclable water into the cultivation tank (10) from a recycle tank (100).
