The utility model discloses a forced-ventilated outdoor equipment cabinet based on cable trench air flow heat exchange, which comprises a cabinet body. An exhaust fan is arranged in the cabinet body. The forced-ventilated outdoor equipment cabinet is characterized in that an air inlet is arranged at the bottom of the cabinet body and is communicated with a cable trench. The forced-ventilated outdoor equipment cabinet is based on a cable trench air flow heat exchange technique. Air in the cable trench below the working site of the outdoor cabinet is used for heat dissipation, i.e. the air in the cable trench is absorbed into the outdoor cabinet from the air inlet at the bottom of the outdoor cabinet. The air intake method is a compensation for a regular air intake method. Thereby, the normal operation of electronic equipment in the cabinet can be ensured.