A method and a device for removing backing adhesive, typically a mixture of CaCO3 3 and SBR, from a carpet. The method includes: (a) sorting the carpets into different categories according to the materials from which the fibers of the carpets are made; (b) removing the bottom layer from a sorted carpet; and (c) removing the backing adhesive by grinding it off the carpet with a grinder until all the adhesive is removed and the fibers of the carpet become loss, which is then collected for recycle. The device is specifically designed to perform the above method and includes a grinder, a feeding device and a pressing wheel device on a frame. The feeding device has an active roller and a passive roller positioned on a support base. The active roller adjoins the grinding wheel and the passive roller presses against the active roller; and the pressing wheel device comprises a pressing wheel roller provided on the framework support base and adjoining the grinding wheel, and a spring pressing position defining mechanism for pushing the pressing wheel roller to a prescribed distance from the grinding wheel.