The invention discloses a wood lathe. The wood lathe comprises a main shaft box assembly, a knife bracket assembly, a tail bracket assembly, a lathe body and supporting legs as well as at least one lathe body extending piece, wherein the lathe body extending piece is arranged on one end, which is far from the lathe body, of the main shaft box assembly, or the lathe body extending piece is arranged on the supporting legs which are far from the main shaft box assembly, or the lathe body extending piece is arranged on the side of the lathe body and is close to the main shaft box assembly. The wood lathe provided by the invention has the advantages that the structure is simple, the design is ingenious, a main shaft box body can move to be used on the right end of the lathe body without disassembling a tail bracket, the secondary positioning is exactly and rapidly realized, the installation is convenient, the operation is simple, the time is saved, the labor is saved, the wood lathe has the good practicability, and the good economic benefits and the social benefits are generated.