The present invention discloses a flat-mouth copper wire hot rolling pressing apparatus, which comprises a bracket, an installation seat, a bearing, a nut, a screw rod, a rolling pressing lower mold, a transmission motor, a belt wheel, a support seat, a wire collection wheel, and a motor. Compared with the apparatus in the prior art, the apparatus of the present invention has the following characteristics that: a round-mouth copper wire passes through the lower rolling pressing mold, the nut rotates to make the screw rod move downward so as to press the copper wire through the hot rolling pressing wheel, the hot rolling pressing wheel is electrified and heated, the transmission motor is started when achieving a certain temperature, the transmission motor drives the hot rolling pressing wheel to rotate, the round-mouth copper wire is rolled and pressed into the flat-mouth copper wire, and the motor drives the wire collection wheel to rotate so as to collect the rolled and pressed flat-mouth copper wire. According to the present invention, the apparatus adopts the hot rolling pressing technology, such that the plasticity of the copper wire can be increased, and the internal stress of the plastic deformation can be eliminated so as to achieve one-time processing molding and improve processing efficiency.