Construction method of underground continuous wall

The invention discloses a construction method of an underground continuous wall. The method includes steps of firstly, preparing a guide wall; secondly, preparing slurry; thirdly, dividing groove segments; fourthly, preparing equipment; fifthly, performing grooving construction; sixthly, trimming the grooves, cleaning bottoms and replacing the slurry; seventhly, preparing reinforcement cages, cleaning the grooves, and checking the grooves; eighthly, applying lock tubes; ninthly, placing the reinforcement cages; tenthly, concreting under water; eleventhly, pulling out the lock tubes; and twelfthly, maintaining the concrete for 10-15 days. By using a heavy grooving machine as grooving equipment of soil layers and a slot milling machine to perform grooving to rock stratums, technical problems of grooving in penetrating the soil layers and the rock stratums are solved. The reinforcement cages are used as preparing platforms, so that mounting quality and precision of the reinforcement cages and embedded parts are