The utility model provides a portable multi -function device of marine ranching, include: square flotation tank, circular support column and support landing system. The life building has been laid at the middle part of the upper surface of square flotation tank, the four corners position of square flotation tank is worn to locate by circular support column, and circular support column can be followed vertical direction and reciprocated, when circular support column moved down, its bottom can be inserted in the seabed and supported the square flotation tank, system configuration is risen and fallen on the square flotation tank to the support for at the circular support column of vertical side's rebound, so that produce relative movement between circular support column and the square flotation tank. The utility model discloses a portable multi -function device of marine ranching sets up the life building at the upper surface of square flotation tank main part, and it is whole can to carry out level or vertical migration in nearly bank sea area, and working space is big, operation area is wide, has satisfied the multi -functional packaged plant's that can go on monitoring at nearly bank culture area manufacturing and designing and implementation condition, the function of realization fishery amusement and recreation and aquaculture environment condition monitoring.