Seabed polymetallic nodule CO2 jet flow collection device and method

The invention discloses a seabed polymetallic nodule CO2 jet flow collection device and method. The device comprises a walking driving device, a central monitoring device, an ore storage device, a liquid CO2 supply device and a liquid CO2 jet flow collection device. The ore storage device is mounted at the top of the walking driving device; the liquid CO2 supply device is surrounded at the top end of the ore storage device by a metal shell and comprises a CO2 storage device, a liquefying device, a liquid CO2 storage device, a connecting pipeline and a valve; the jet flow collecting device is installed at the front end of the ore storage device and comprises a collecting head body, a hydraulic rod and a jet flow pipeline connected with a liquid CO2 supply device, and a front row and a rear row of inclined high-pressure jet flow nozzles are arranged in the jet flow collecting device so as to achieve regional accurate collection of nodules. According to the method, the special deep sea environment is utilized, t