An automatic elastic expandable spinal implant comprises a main body (10) and two link rods (20, 30). The main body (10) comprises a base portion (11) and two side extension portions (12, 13). The two side extension portions (12, 13) have distal ends (15, 16), respectively. The two link rods (20, 30) are disposed inside the base portion (11) and the two side extension portions (12, 13) of the main body (10). The two link rods (20, 30) have outer ends (21, 31) hingedly connected with the distal ends (15, 16) of the two side extension portions (12, 13) of the main body (10) at a second pivot portion (36) and a third pivot portion (37) respectively. The two link rods (20, 30) have inner ends (22, 32), respectively. The inner ends (22, 32) of the two link rods (20, 30) are hingedly connected with each other at a first pivot portion (33). At least one of the main body (10) and the two link rods (20, 30) is capable of elastic deformation. When the two link rods (20, 30) are pushed or pulled a predetermined distance (A) from the base portion (11) of the main body (10), the two link rods (20, 30) automatically expand away from the base portion (11) of the main body (10). The operation of the present invention is more improved.
