A system comprising: - a bottle blow moulding machine having a machine frame, - a linkage for mould opening and closing and bottom mould positioning, mounted on the bottle blowing machine, comprising: - a mould opening and closing assembly having a mould opening state and a mould closing state, which comprises: - a bottom mould movable relative to the machine frame of the bottle blowing machine in up-down direction, - a fixed mould plate fixedly disposed on the machine frame, and - a moving mould plate rotatable relative to the machine frame; and - a bottom mould positioning assembly for fixing the bottom mould with the machine frame of the bottle blowing machine; whereby when the mould opening and closing assembly is in the mould closing state, the moving mould plate is engaged with the fixed mould plate, and the moving mould plate, the fixed mould plate and the bottom mould together enclose to provide a cavity; wherein the bottom mould positioning assembly comprises: - a stop block disposed at the bottom of the moving mould plate; - a sliding block slidable relative to the machine frame; - wherein when the mould opening and closing assembly is in the mould closing state, both the sliding block and the stop block are inserted between the bottom mould and the machine frame and contact against the bottom mould, and - wherein when the mould opening and closing assembly is in the mould opening state, the moving mould plate is opened relative to the fixed mould plate, and the stop block and the sliding block are detached from the bottom mould, the system being characterized in further comprising: - a swing member swingably connected on the machine frame around a first axis for driving the sliding of sliding block; and - a rotation member rotatable relative to the machine frame for driving the swinging of the swing member relative to the machine frame during its rotation, and the rotation member and the moving mould plate being fixedly connected on a rotation shaft which is driven by a power source to rotate a second axis, - wherein the first axis and the second axis are parallel to each other. - a bottle blow moulding machine having a machine frame, - a linkage for mould opening and closing and bottom mould positioning, mounted on the bottle blowing machine, comprising: - a mould opening and closing assembly having a mould opening state and a mould closing state, which comprises: - a bottom mould movable relative to the machine frame of the bottle blowing machine in up-down direction, - a fixed mould plate fixedly disposed on the machine frame, and - a moving mould plate rotatable relative to the machine frame; and - a bottom mould positioning assembly for fixing the bottom mould with the machine frame of the bottle blowing machine; whereby when the mould opening and closing assembly is in the mould closing state, the moving mould plate is engaged with the fixed mould plate, and the moving mould plate, the fixed mould plate and the bottom mould together enclose to provide a cavity; wherein the bottom mould positioning assembly comprises: - a stop block disposed at the bottom of the moving mould plate; - a sliding block slidable relative to the machine frame; - wherein when the mould opening and closing assembly is in the mould closing state, both the sliding block and the stop block are inserted between the bottom mould and the machine frame and contact against the bottom mould, and - wherein when the mould opening and closing assembly is in the mould opening state, the moving mould plate is opened relative to the fixed mould plate, and the stop block and the sliding block are detached from the bottom mould, - a swing member swingably connected on the machine frame around a first axis for driving the sliding of sliding block; and - a rotation member rotatable relative to the machine frame for driving the swinging of the swing member relative to the machine frame during its rotation, and the rotation member and the moving mould plate being fixedly connected on a rotation shaft which is driven by a power source to rotate a second axis, - wherein the first axis and the second axis are parallel to each other.