Production method for hot rolled structural steel and capable of avoiding blackening defect on acid-pickled steel

The invention relates to a production method for hot rolled structural steel and capable of avoiding the blackening defect on the acid-pickled steel. The production method comprises the following processes: converter smelting, refining, continuous casting, rough rolling, finish rolling, laminar flow cooling, coiling and acid pickling, wherein in the process of finish rolling, the initial finish rolling temperature is 980-1080 DEG C, and the final finish rolling temperature is 830-890 DEG C; in the process of finish rolling, when the finish product thickness is greater than or equal to 4.0 mm, the interstand cooling water valves of 6 finish rolling units are fully opened, and the proportion of the interstand cooling water of the first 4 units is 20-50%; when the finish product thickness is less than 4.0 mm, the number of units of which the interstand cooling water valves are opened is less than or equal to 3; and the laminar cooling velocity is higher than or equal to 45 DEG C/s. According to the production me