The invention provides a steel bar conveying system. The steel bar conveying system comprises a conveying rail, a rail car and a plurality of steel bar supporting platforms, wherein the conveying railextends to a second position from a first position; the rail car is arranged on the conveying rail and does reciprocating motion between the first position and the second position along the conveyingrail; a steel bar supporting surface is arranged at the top of the rail car; the plurality of groups of steel bar supporting platforms are divided into two groups; the two groups of steel bar supporting platforms are arranged at two opposite sides of the conveying rail respectively; the plurality of steel bar supporting platforms in each group are distributed at intervals along the extending direction of the conveying rail; each steel bar supporting platform comprises a supporting frame and a rolling shaft which is arranged on the top surface of the supporting frame in a rotating manner; therolling shaft is vertical to the conveying rail; and the top surface of the rolling shaft and the steel bar supporting surface are located on the same horizontal plane. The steel bar conveying systemprovided by the invention is applicable to conveying of steel bars with different sizes and damages to line forms of large-size steel bars in a conveying process of the large-size steel bars can be reduced.