A server sliding rail quick release mounting structure includes left and right server sliding rail assemblies, a support bar set, a first quick release and a second quick release for detachably connecting the two opposite ends of the support bar set to the left and right server sliding rail assemblies, and an adjustment structure having a connection plate, a retaining element and an adjustment member. A cable management rack may be supported at the left or right server sliding rail assembly, and the adjustment member is rotatable through 180° to fit the mounting direction of the cable management rack.