The invention discloses a shaft head of manufactured center machine, which comprises the following parts: frame head seat, which possesses rail groove on the positive surface to extend along axle Z, shaft seat, which pierces the rail groove along axle Z with at least one first groove channel and at least one second groove channel on two opposite sides along Z shaft, line rail group, which consists of at least one first line rail and at least one second line rail in the first and second groove channel separately along axle Z, sliding group, which consists of multiple first and second sliding blocks, wherein the first and second sliding blocks are fixed on two groove walls, which pierces the first and second groove channel to mate the first and second line rails.

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