The invention relates to a continuously variable transmission (CVT), which is changed into non-friction tooth-mesh transmission from friction transmission. The continuously variable transmission has asimple structure, wherein only a plurality of positive and negative pawls or a plurality of long-short ratchet wheel type grooves are arranged on cone-shaped plates on two sides of a driving wheel and a driven wheel; the two sides or the bottom surface of a flexible piece (including a chain, a belt or a rope type chain belt) are provided with a plurality of pawls or a plurality of ratchet wheel type grooves; and the pawls are telescopic, are meshed with each other sequentially or randomly, and achieve the non-friction tooth-mesh transmission by meeting a concave gear.