The invention discloses a folding-tower-type cable-stayed bridge with an openable deck. The bridge comprises a steel folding tower, a steel main beam, a rotation system, an anchor sliding system, a concrete main pier and a concrete side pier, wherein the rotation system comprises a stay cable, a folding tower back cable, a tower cable rotating hinge, a back cable tensioning system device, a beam pier rotating hinge and a tower pier rotating hinge, the anchor sliding system comprises a movable anchoring structure, a horizontal movable box chamber, a horizontal steel slide way and a tetrafluoroethylene steel slide block, the front surface of the steel folding tower is connected with the steel main beam through the stay cable, and the back surface of the steel folding tower is connected withthe movable anchoring structure through the folding tower back cable bypassing the tower cable rotating hinge. According to the bridge, the special achieving scheme of the navigation clearance limit requirement is met, the subtle mechanical balance is achieved through the reasonable arrangement of the cables and the towers, the rotation of the steel folding tower is directly realized through vertical-direction tensioning of the folding tower back cable tensioning system device and horizontal sliding of the movable anchoring structure, and opening of the steel main beam bridge deck is indirectly realized.