The invention discloses a real-time monitoring instrument of a submersible type profile ocean-current meter. The real-time monitoring instrument comprises an underwater unit and an on-water unit, wherein a detecting device is arranged in a pressure-resistant sealing shell of the underwater unit and comprises a data acquisition module and a power supply module I; the data acquisition module comprises a circuit board I, a single chip microcomputer I and a digital triaxial acceleration sensor; a signal receiving device is arranged in an anti-spilling sealing shell of the on-water unit and comprises a signal receiving module, a liquid crystal display, a power supply module II and a battery; the signal receiving module comprises a circuit board II and a single chip microcomputer II. A use method of the real-time monitoring instrument comprises the following steps of: (1) installing the underwater unit on the submersible type profile ocean-current meter; (2) putting the submersible type profile ocean-current meter in place, checking whether the reading of the on-water unit is normal or not and getting return ropes back; (3) getting the return ropes back and determining whether the reading of the on-water unit is normal; and (4) getting the underwater unit back. The real-time monitoring instrument disclosed by the invention has the beneficial effect that the working efficiency of a putting person is greatly improved.