A method for continuous production of ozone strong water, the method comprising the steps of: a) injecting an acidification agent into a pressurized feed water stream to maintain a pH value of the pressurized feed water stream below 7; b) feeding the pressurized feed water stream, after injection of the acidification agent, into a dissolution column to form a body of acidic pressurized water therein; c) diffusing a two-phase mixture of oxygen-ozone gas (124, 126) and recirculated water into the body of acidic pressurized water in the dissolution column to dissolve ozone into the acidic pressurized water, thereby producing the ozone strong water therein; d) maintaining a pressure of the dissolution column within a pre-determined pressure range by a controlled release of an off-gas stream from the dissolution column; e) discharging the ozone strong water from the dissolution column; and f) adjusting a flow rate of the ozone strong water discharged from the dissolution column to match a flow rate of the pressurized feed water stream fed into the dissolution column after the injection of the acidification agent, so as to simultaneously maintain a start-up mode in an upper portion of the dissolution column that favors high efficiency of ozone mass transfer into the acidic pressurized water and a steady-state in a lower portion of the dissolution column that favors a high concentration of dissolved ozone in the acidic pressurized water coexistent in the body of the acidic pressurized water in the dissolution column, wherein a concentration gradient of dissolved ozone is formed along a height of the body of the acidic pressurized water, characterized in that step b) comprises the sub-steps of: b1) feeding the pressurized feed water stream after injection of the acidification agent into to a pre-treatment dissolution column to form a body of pre-treatment acidic pressurized water, thereby producing pre-treated ozonated water therein; b2) pumping the produced pre-treated ozonated water into the dissolution column; b3) injecting the off-gas stream released from the dissolution column into the body of pre-treatment acidic pressurized water to produce a pre-treated ozonated water in the pre-treatment dissolution column; and b4) maintaining a pressure of the pre-treatment dissolution column lower than that of the dissolution column through releasing an off-gas stream from the pre-treatment dissolution column. a) injecting an acidification agent into a pressurized feed water stream to maintain a pH value of the pressurized feed water stream below 7; b) feeding the pressurized feed water stream, after injection of the acidification agent, into a dissolution column to form a body of acidic pressurized water therein; c) diffusing a two-phase mixture of oxygen-ozone gas (124, 126) and recirculated water into the body of acidic pressurized water in the dissolution column to dissolve ozone into the acidic pressurized water, thereby producing the ozone strong water therein; d) maintaining a pressure of the dissolution column within a pre-determined pressure range by a controlled release of an off-gas stream from the dissolution column; e) discharging the ozone strong water from the dissolution column; and f) adjusting a flow rate of the ozone strong water discharged from the dissolution column to match a flow rate of the pressurized feed water stream fed into the dissolution column after the injection of the acidification agent, so as to simultaneously maintain a start-up mode in an upper portion of the dissolution column that favors high efficiency of ozone mass transfer into the acidic pressurized water and a steady-state in a lower portion of the dissolution column that favors a high concentration of dissolved ozone in the acidic pressurized water coexistent in the body of the acidic pressurized water in the dissolution column, wherein a concentration gradient of dissolved ozone is formed along a height of the body of the acidic pressurized water, characterized in that step b) comprises the sub-steps of: b1) feeding the pressurized feed water stream after injection of the acidification agent into to a pre-treatment dissolution column to form a body of pre-treatment acidic pressurized water, thereby producing pre-treated ozonated water therein; b2) pumping the produced pre-treated ozonated water into the dissolution column; b3) injecting the off-gas stream released from the dissolution column into the body of pre-treatment acidic pressurized water to produce a pre-treated ozonated water in the pre-treatment dissolution column; and b4) maintaining a pressure of the pre-treatment dissolution column lower than that of the dissolution column through releasing an off-gas stream from the pre-treatment dissolution column. b1) feeding the pressurized feed water stream after injection of the acidification agent into to a pre-treatment dissolution column to form a body of pre-treatment acidic pressurized water, thereby producing pre-treated ozonated water therein; b2) pumping the produced pre-treated ozonated water into the dissolution column; b3) injecting the off-gas stream released from the dissolution column into the body of pre-treatment acidic pressurized water to produce a pre-treated ozonated water in the pre-treatment dissolution column; and b4) maintaining a pressure of the pre-treatment dissolution column lower than that of the dissolution column through releasing an off-gas stream from the pre-treatment dissolution column.