The present invention relates to a support plate for protecting street trees capable of adjusting a size thereof, comprising: a disk type support main body whose one side is cut by heating a waste tire grinding chip for 15-30 minutes at a temperature of 300-500°C, mixing 80-95 wt% of the heated waste tire grinding chip with 5-20 wt% of soft resin, forming waste tire resin, and injecting and molding mixed waste tire resin to a mold an upper projecting rim protruding upwards to be in close contact with the stem of the street trees in a central edge of the support main body a male assembly formed on the edge of one side of the cut support main body and a plurality of female assemblies formed on the edge of the other side of the cut support main body. As waste tire powder is molded in a form of a chip from a waste tire whose waste disposal is difficult, and then the tire is recycled again, thereby the tire can be recycled as a waste valuable resource. As calcium chloride sprayed to remove snow in winter is stacked around by the disk type support main body and the upper projecting rim, the growth of street trees is significantly reduced. The calcium chloride is prevented from flowing into a root so as to prevent an accident of necrosis of the street trees, the street trees can live for a long period of time. As a diameter of the support plate can be changed, as much as a diameter to be increased according to an increase in a diameter of a street tree depending on the growth of the street tree, using female and male assemblies formed in both cut edges of a support main body, it can be used for a long time.COPYRIGHT KIPO 2016본 발명에 따른 크기의 조절이 가능한 가로수보호용 받침판은, 폐타이어분쇄칩을 300~500℃의 온도에서 15~30분정도 가열하고 가열된 폐타이어분쇄칩 80~95중량%와 연질수지 5~20중량%를 혼합하여 폐타이어수지를 형성시키고 혼합된 폐타이어수지를 금형에 투입하여 성형시켜, 일측이 절개된 원반형 받침본체와, 상기 받침본체의 중앙의 가장자리에 가로수의 줄기에 밀착되게 상방으로 돌출형성된 상방돌출테와, 상기 절개된 받침본체의 일측 가장자리에 형성된 숫형 조립부와 상기 절개된 받침본체의 타측 가장자리에 다수가 형성된 암형 조립부가 형성되어, 폐기처리가 곤란한 폐타이어를 분말의 칩형태로 성형하여 이를 다시 재활용하여 소중한 폐자
