Coiled steel straightening and cutting device and method for construction site

The invention relates to the technical field of steel straightening and cutting, and provides a coiled steel straightening and cutting device for a construction site and a cutting method.The coiled steel straightening and cutting device comprises a left shell, a first telescopic rod can be installed on the back face of the left shell, a lower sliding rod is fixedly connected to the middle of the right side of the left shell, and an upper sliding rod is arranged above the lower sliding rod. Through the arrangement of the length detection mechanism, after a cutting tool cuts off a certain amount of coiled steel, the detection base and the supporting seat can receive one piece of coiled steel, the length of the cut coiled steel is detected through the laser range finder and the reflector, and the detected actual length of the coiled steel is compared with the target length; if the length is larger than the target length, the driving motor rotates clockwise to enable the moving seat to adjust the difference dista