Batholith seabed high-voltage submarine cable laying and protecting method

The invention relates to a batholith seabed high-voltage submarine cable laying and protecting method comprising the following steps: (1) submarine cable laying preparation: before the submarine cableis laid, cleaning a cable route and clearing away obstacles such as shipwrecks and fishing nets on the seabed in a route area; (2) laying a submarine cable at a landing end: digging a trench in a shallow mudflat section by using an amphibious excavator to lay the submarine cable; (3) laying the submarine cable on a batholith seabed with a thick soft covering layer: digging a trench by using a high-pressure water-jet trenching plough to lay the submarine cable; and (4) laying the submarine cable on a batholith seabed with a shallow soft covering layer and exposing bedrock: mechanically digginga trench by using a mechanical cutting burying machine to lay the submarine cable or directly laying the submarine cable on the batholith seabed and taking a protective measure. The method reasonablylays and properly protects