The invention relates to an airflow based low-voltage polyethylene cable irradiation cooling device. For ultraviolet cross-linking equipment, a cooling system with excellent cooling effect is needed urgently. The airflow based low-voltage polyethylene cable irradiation cooling device comprises a control cabinet (1), the control cabinet controls a cross-linking irradiation unit (2) or more than two cross-linking irradiation units (2) serially connected together, each cross-linking irradiation unit comprises a shell (3), an air outlet (4) is arranged on each shell and connected with an exhaust fan (6) through an exhaust pipeline (5), a cable (7) enters each shell via a cable inlet (8) and penetrates out of a cable outlet (9) along an axis of the shell, a group of rectifying boxes are uniformly distributed along the periphery of each shell, an arc reflecting cover (11) is mounted inside each rectifying box, each rectifying box is correspondingly provided with an air inlet (12) which is connected with an air inlet fan (14) through an air inlet pipeline (13), an ultraviolet lamp source (15) is mounted inside each reflecting cover, and thermocouples (16) with the heads close to the ultraviolet lamp sources penetrate through the rectifying boxes and the reflecting covers correspondingly. The device is used for cooling cable ultraviolet cross-linking irradiation equipment.