The invention discloses a thermal infrared processing apparatus for signal cable preparation. The thermal infrared processing apparatus comprises a rack, wherein fastening wheels are arranged on the end part of the rack; solar thin film cells are arranged between the fastening wheels; the rack is provided with transmission wheels; the rack is provided with a mounting shell; a circuit board is arranged at the internal bottom of the mounting shell; a plurality of infrared lamps are arranged at the bottom of the mounting shell; the infrared lamps are electrically connected with the circuit board; the circuit board is connected with the solar thin film cells through electric wires; a thermal processing chamber is arranged in the rack; the mounting shell is arranged in the thermal processing chamber; a guiding tube is arranged at the internal bottom of the rack; a cyclophon is arranged in the guiding tube in a sleeving manner; a lifting mirror surface is arranged on the end part of the cyclophon; and the lifting mirror surface is parallel to the mounting shell. By adoption of the thermal infrared processing apparatus, the heating efficiency on the signal cable can be greatly improved, so that drying and curing processing on the signal cable can be carried out conveniently.