Assembling method for large truss type pile leg structure

The present invention discloses an assembly method of large trussed pile leg structure. Said method includes the following steps: first step, utilizing horizontal construction mode and using main side pipe positioned in one end as reference to assemble single-sheet structure of every pile leg part, the length of every described single-sheet structure is 15-25 meters; second steps, utilizing mould frame to make three identical single-sheet structures be formed into a regular trilateral trussed pile leg part; and third step, assembling all the pile leg parts together so as to obtain the invented large trussed pile leg structure.