The present invention relates to a steering system of the forklift. Claim for the steering system of the present invention comprises supplying a first hydraulic line and a hydraulic fluid into the right chamber for supplying operating fluid to the steering cylinder, and the left chamber of steering the vehicle to the right or left by the hydraulic fluid being supplied to the left chamber or right chamber in the steering system of a forklift that includes a second hydraulic line, and the driving speed sensor for sensing a running speed of the vehicle; FIG steering angle for sensing the steering angle of the vehicle detection means; A memory unit for storing also a predetermined running speed by the steering angle and safety; Help secure the steering angle memory portion corresponding to the traveling speed input from the running speed sensor, a steering angle as compared to a steering angle input from the sensing means with each other, steering angle a is larger steering angle input from the sensing means, the steering angle relative to the running speed of the vehicle degrees and a controller for determining to output a control signal to be greater; When the control signal is output from the controller, and to reduce the hydraulic fluid fed to left and right chambers of a steering cylinder with a throttle valve that is installed in each of the first and second hydraulic lines. According to the present invention, by controlling the steering angle of the vehicle according to the running speed it can be prevented in a rapid steering of the vehicle. Therefore, it is possible to prevent the rapid steering of the vehicle it is possible to prevent rollover accidents due to rapid steering the vehicle, thereby improving the running stability of the vehicle.