The invention belongs to the architectural engineering technology field, and particularly relates to a roof gutter system of a material yard arch covering. The roof gutter system of the material yardarch covering comprises a main body structure and a bracket connected with the main body structure, wherein a purlin is fixed on the upper portion of the bracket, a stainless steel gutter is arrangedon the purlin and connected with the purlin, a snow melting device is installed on the lower portion of the stainless steel gutter, and snow stop structures are arranged on two sides of the stainlesssteel gutter. By arranging the snow stop structures on the two sides of the stainless steel gutter, the roof gutter system of the material yard arch covering can prevent that large size accumulated snow blocks on two sides of the covering slip off, and then impact the stainless steel gutter and the covering, enables snow water and small size snow blocks to pass through the snow stop structures andfall into the gutter, can melt ice and snow which fall into the gutter by using heat generated by the snow melting system on the lower portion of the gutter, discharges the molten ice and snow through a downpipe, and guarantees that a whole drainage system can smoothly work in cold icy and snowy weather.