An automatic winding device for cell core includes a mounting seat, a locking cap mounted on one end of the mounting seat, a winding assembly driving mechanism mounted on the other end of the mounting seat and a winding assembly. The winding assembly includes two winding needles and two winding plates. One end of the winding needles is fixed to the winding driving mechanism and the other end is opposite to the locking cap. One end of the winding plates is fixed to the winding driving mechanism and the other end thereof opposite to the locking cap. The winding plates are disposed on opposing sides of the pair of winding needles and separably contact the pair of winding needles. The winding needles are held together by complementary concave and convex portions, and a groove and a ring groove are formed in the locking cap.