Method for constructing continuous high pressure jetting diaphragm wall by planing and milling method

The invention discloses a method for constructing a continuous high pressure jetting diaphragm wall by a planing and milling method. The method is characterized in that milling teeth are mounted on a long arm and a scarifier of a special long-arm excavator, nozzles are mounted among the milling teeth, a high-pressure fluid pipeline is arranged on an excavator arm, high-pressure cement slurry and compressed air are conveyed to the nozzles through the pipeline, a high-speed jet flow is formed to pre-cut a stratum, the high-speed jet flow cooperates with the planing and milling action of a milling tool to jointly impact, crush and mill the stratum, the cement slurry can play a role in protecting the wall in the operation process and can be automatically condensed after being mixed with materials in an original stratum, and therefore the continuous diaphragm with the high anti-seepage performance is formed. According to the method, the high-speed jet flow is formed to pre-cut the stratum, the high-speed jet flow