The utility model provides a support lifting structure of an operating table,It is a frame plate,At least one tooth group is arranged under one of the frame plates,The at least one tooth group comprises a first rack and a second rack,The second rack is pivoted to the first rack with a first pivoting piece,At least one first transmission gear is tooth connected with the at least one tooth piece,Rotating by at least one first transmission gear,Move the at least one tooth group and the frame plate downward,The at least one first transmission gear passes through the second rack and the first rack in sequence,Passing the second rack through the operating table,The second rack rotates at that end of the first rack,The other end of the second rack is fixed under one of the operating tables.本新型提供一種手術台之支架升降結構，其係一架板，至少一齒件組設置於該架板之一下方，該至少一齒件組包含一第一齒條及一第二齒條，該第二齒條以一第一樞接件樞接於該第一齒條，至少一第一傳動齒輪與該至少一齒件組齒接，藉由該至少一第一傳動齒輪轉動，使該至少一齒件組及該架板向下移動，該至少一第一傳動齒輪依序經過該第二齒條及該第一齒條，使該第二齒條穿過該手術台，該第二齒條再於該第一齒條之該端轉動，使該第二齒條之另一端固設於該手術台之一下方。
