A bottle blowing machine, comprising a machine frame; a mould opening and closing assembly having a mould opening state and a mould closing state, which comprises a fixed mould plate fixedly disposed on the machine frame, a bottom mould slidable in a vertical direction relative to the fixed mould plate, and a moving mould plate rotatably connected with the fixed mould plate by a rotation shaft, when the mould opening and closing assembly is in the mould closing state, the fixed mould plate, the moving mould plate and the bottom mould together enclose to provide a cavity; an elevating assembly, characterised in that the elevating assembly comprises a protrusion fixedly disposed on the rotation shaft, an elevating rod fixedly connected with the bottom mould, and a sliding block fixed on the elevating rod, a guiding groove being opened on the protrusion, and the sliding block being slidably inserted into the guiding groove, in the course of rotation of the rotation shaft, the contact position of the guiding groove with the sliding block rises or descends, and the sliding block moves in the up-down direction under the guiding of the guiding groove; a bottom mould locking assembly for locking the bottom mould with the machine frame, comprising a plurality of locking parts slidably disposed on the machine frame in a horizontal direction, multiple swing members swingably connected with the machine frame around a first axis for driving the sliding of the plurality of locking parts, and a rotation member fixedly connected with the rotation shaft and rotatable relative to the machine frame around a second axis, for controlling the swinging of the swing members relative to the machine frame, when the mould opening and closing assembly is in the mould closing state, the plurality of locking parts respectively contact against the bottom mould such that the bottom mould is separated from the machine frame; and a power source for driving the rotation of the rotation shaft. a machine frame; a mould opening and closing assembly having a mould opening state and a mould closing state, which comprises a fixed mould plate fixedly disposed on the machine frame, a bottom mould slidable in a vertical direction relative to the fixed mould plate, and a moving mould plate rotatably connected with the fixed mould plate by a rotation shaft, when the mould opening and closing assembly is in the mould closing state, the fixed mould plate, the moving mould plate and the bottom mould together enclose to provide a cavity; an elevating assembly, characterised in that the elevating assembly comprises a protrusion fixedly disposed on the rotation shaft, an elevating rod fixedly connected with the bottom mould, and a sliding block fixed on the elevating rod, a guiding groove being opened on the protrusion, and the sliding block being slidably inserted into the guiding groove, in the course of rotation of the rotation shaft, the contact position of the guiding groove with the sliding block rises or descends, and the sliding block moves in the up-down direction under the guiding of the guiding groove; a bottom mould locking assembly for locking the bottom mould with the machine frame, comprising a plurality of locking parts slidably disposed on the machine frame in a horizontal direction, multiple swing members swingably connected with the machine frame around a first axis for driving the sliding of the plurality of locking parts, and a rotation member fixedly connected with the rotation shaft and rotatable relative to the machine frame around a second axis, for controlling the swinging of the swing members relative to the machine frame, when the mould opening and closing assembly is in the mould closing state, the plurality of locking parts respectively contact against the bottom mould such that the bottom mould is separated from the machine frame; and a power source for driving the rotation of the rotation shaft.