The invention relates to a yarn carrier. The yarn carrier comprises a dismountable base used for being installed on a guiderail, a yarn carrier main body and a movable hinge arranged at the upper endof the yarn carrier main body, the base and the yarn carrier main body are detachably connected, a plurality of rolling bodies are arranged on the outer surface of the base and are in rolling contactwith the guiderail, and then the base slides along the guiderail. The invention further relates to a three-dimensional braiding machine provided with the yarn carrier. The rolling friction between theyarn carrier and the guiderail replaces the sliding friction, the frictional resistance and the use loss are reduced in the braiding process, and a braiding position occupied by the yarn carrier is conveniently changed or the yarn carrier is increased or reduced according to the requirement of the process in the four-step three-dimensional braiding process.