A system comprising: a bottle blow moulding machine having a machine frame (31, 32, 33), a linkage for mould opening and closing and bottom mould positioning, mounted on the bottle blowing machine, the linkage 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 a 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, wherein the moving mould plate is fixedly connected on a rotation shaft which is driven by a power source to rotate around an axis of rotation; and a bottom mould positioning assembly for fixing the bottom mould with the machine frame of the bottle blowing machine; wherein 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; characterized in that the bottom mould positioning assembly comprises: a plurality of sliding blocks (42, 43) slidably disposed on the machine frame (31, 32, 33); multiple swing members (44, 45) swingably disposed on the machine frame (31, 32, 33) for driving the sliding of the plurality of sliding blocks (42, 43); and a rotation member rotatable relative to the machine frame for driving the swinging of the swing members (44, 45) relative to the machine frame during its' rotation, the rotation member being fixedly connected on the rotation shaft, wherein when the mould opening and closing assembly is in the mould closing state, the plurality of sliding blocks (42, 43) are inserted between the bottom mould and the machine frame (31, 32, 33) and contact against the bottom mould, when the mould opening and closing assembly is in the mould opening state, the plurality of sliding blocks (42, 43) are detached from the bottom mould. a bottle blow moulding machine having a machine frame (31, 32, 33), a linkage for mould opening and closing and bottom mould positioning, mounted on the bottle blowing machine, the linkage 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 a 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, wherein the moving mould plate is fixedly connected on a rotation shaft which is driven by a power source to rotate around an axis of rotation; and a bottom mould positioning assembly for fixing the bottom mould with the machine frame of the bottle blowing machine; a mould opening and closing assembly having a mould opening state and a mould closing state, which comprises a bottom mould movable relative to a 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, wherein the moving mould plate is fixedly connected on a rotation shaft which is driven by a power source to rotate around an axis of rotation; and a bottom mould positioning assembly for fixing the bottom mould with the machine frame of the bottle blowing machine; wherein 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; characterized in that the bottom mould positioning assembly comprises: a plurality of sliding blocks (42, 43) slidably disposed on the machine frame (31, 32, 33); multiple swing members (44, 45) swingably disposed on the machine frame (31, 32, 33) for driving the sliding of the plurality of sliding blocks (42, 43); and a rotation member rotatable relative to the machine frame for driving the swinging of the swing members (44, 45) relative to the machine frame during its' rotation, the rotation member being fixedly connected on the rotation shaft, wherein when the mould opening and closing assembly is in the mould closing state, the plurality of sliding blocks (42, 43) are inserted between the bottom mould and the machine frame (31, 32, 33) and contact against the bottom mould, when the mould opening and closing assembly is in the mould opening state, the plurality of sliding blocks (42, 43) are detached from the bottom mould. a plurality of sliding blocks (42, 43) slidably disposed on the machine frame (31, 32, 33); multiple swing members (44, 45) swingably disposed on the machine frame (31, 32, 33) for driving the sliding of the plurality of sliding blocks (42, 43); and a rotation member rotatable relative to the machine frame for driving the swinging of the swing members (44, 45) relative to the machine frame during its' rotation, the rotation member being fixedly connected on the rotation shaft, wherein when the mould opening and closing assembly is in the mould closing state, the plurality of sliding blocks (42, 43) are inserted between the bottom mould and the machine frame (31, 32, 33) and contact against the bottom mould, when the mould opening and closing assembly is in the mould opening state, the plurality of sliding blocks (42, 43) are detached from the bottom mould.