The invention discloses an ultra-high-voltage DC double-column coupled composite post insulator earthquake resistance test model and a quality simulation method. The ultra-high voltage DC double-column coupled composite post insulator earthquake resistance test model comprises an inner side pipe bus; two ends of the inner side pipe bus are provided with a single column test model; the single post test model comprises a support and a single column post insulator; the lower end of the single column post insulator is installed on the support; the upper end of the single column post insulator is provided with a counterweight; the upper end of the counterweight is provided with a hardware fitting; and two ends of the outer side pipe bus are connected to the hardware fitting of the single column test model of a corresponding terminal. The ultra-high-voltage DC double-column coupled composite post insulator earthquake resistance test model and the quality simulation method arrange the counterweight on the upper end of the single column post insulator which can effectively simulate an original grading ring and the outer side pipe bus on the top of the single column post insulator, have no influence on an earthquake resistance test, and is simple in structure and easy in test point distribution.