The utility model discloses a tree protection device which comprises a supporting frame and a plurality of tree protection plates, the tree protection plates are arranged on the peripheral wall of a tree trunk at intervals, elastic protection pieces are arranged on the inner sides of the tree protection plates, and the supporting frame is arranged on the outer sides of the tree protection plates in a surrounding mode. According to the utility model, the tree protection plate with the elastic protection piece is arranged between the support frame and the trunk; according to the tree protectiondevice, the elastic protection piece is arranged, so that direct contact between the tree trunk and the supporting frame is avoided, the elastic protection piece can remove impact force of shaking ofthe tree trunk to reduce damage to the tree when the tree is blown by wind and rain, growth of the tree trunk is not limited due to the fact that the elastic protection piece has flexibility, and meanwhile existing damage of the tree can be gradually repaired. The tree protecting support is applied to the field of tree protecting supports.