The utility model provides a heat radiation structure of circuit breaker drawout chassis, includes insulating substrate and conductive copper bar, insulating substrate on offer the conductive copper bar via hole that is used for installing conductive copper bar, conductive copper bar to pass through mounting fixed mounting downthehole excessively at conductive copper bar. Fixed connection is installed with conductive copper bar's lateral wall and insulating substrate's lateral wall respectively in the both ends of mounting to set up electrically conductive the heat dissipation through -hole that is linked together with the conductive copper bar via hole on the mounting. The utility model provides a heat radiation structure of circuit breaker drawout chassis that ventilation efficiency is high, it can the reinforce to suppress the temperature rise, mounting structure is simple.