The utility model discloses a feeding mechanism of an automatic cutting machine for welded steel tube coils. The feeding mechanism of the automatic cutting machine for the welded steel tube coils comprises a main feeding roller shaft, U-shaped plates, a material pressing roller shaft, material pressing roller shaft seats, main feeding roller shaft seats, material pressing oil cylinders and pull rods. The two parallel and corresponding U-shaped plates are installed on a rack and are connected and supported through the four pull rods, the material pressing roller shaft seats are clamped into U-shaped grooves of the two U-shaped plates and are installed at the two ends of the material feeding roller shaft, and the upper ends of the material pressing roller shaft seats are connected with piston rods of the material pressing oil cylinders. The material pressing oil cylinders are installed at the top ends of the U-shaped plates, the material pressing roller shaft is attached to the main feeding roller shaft in the same direction, and the main feeding roller shaft seats are arranged at the two ends of the main feeding roller shaft and are installed on the U-shaped plates through screws. By means of the mode, a whole coiled steel plate can be leveled and rolled to be flat rapidly, the parallelism is corrected, and therefore the plate is prevented from being cut into a diamond steel plate.