The invention discloses a double-node interconnection protection method, and the method comprises the steps: employing SNCP (subnetwork connection protection) to combine a backbone scheduling ring and a business downloading ring into a business scheduling downloading ring; enabling the business scheduling downloading ring to be intersected with a first convergence ring at a first network element and a second network element; enabling the business scheduling downloading ring to be intersected with a second convergence ring at a third network element and a fourth network element; enabling the source time slot of the first network element to be configured at a link side of the first convergence ring; enabling the working time slot of the first network element to be configured in the direction of the second network element; enabling a protection time slot of the first network element to be configured in the direction of the third network element; and enabling the time slot, passing through the first network element, of the second network element to arrive at the fourth network element. The invention also discloses a double-node interconnection protection system.