The invention discloses an automatic correction method for a tyred container door type crane. By depending on detection signals fed back by two ultrasonic sensors at the left end and the right end on the front side of the crane, the method is completed through calculation. The method particularly comprises the following steps of: A, feeding back the detection signals by the ultrasonic sensors according to the distances between the ultrasonic sensors and a position reference object; B, calculating a position P1 and a position P2 of the two sensors according to the detection signals fed back bythe ultrasonic sensors; C, comparing the P1 and the P2 with a set minimum optimal distance a and a maximum optimal distance b, and not executing correction operation if the P1 and the P2 simultaneously are in the range of [a,b]; and if the P1 and the P2 simultaneously are not in the range of [a,b], determining to execute former correction and back correction operation by combining the direction of cart travelling. The method has the advantages of obviously reducing the fault rate of sliding contact power supply trolleys caused by the problem of deviation of carts, improving operating efficiency and safety of RTG, and reducing workload of drivers, along with good correction effect.