▎ 摘　　要

NOVELTY - The utility model claims a special triple filtering device for preparing graphene composite material, comprising: two brackets and a suction filter seat fixedly connected between the brackets; the middle filter head is connected above the top of the suction filter seat through pipeline; the three middle filter heads are arranged at intervals; the middle filtering head is provided with a sand core plate; the middle filtering head is detachably and hermetically connected with a filtering bottle; the top opening of the filtering bottle and the bottom can be detachably and hermetically connected with the middle filtering head; the filtering film is placed in the centre of the sand core plate; the filtering bottle presses the filtering film; the filtering bottle is contacted with the middle filtering head together; the side of the filtering seat is provided with a pumping port, connected with the vacuum air pump; the bottom of the filtering seat is provided with a liquid outlet, connected with the filtrate collecting device; the liquid outlet and the pumping port are set on the same end of the filtering seat. Through the technical solution of the utility model, it can independently filter single sample, also can filter a plurality of samples at the same time, can satisfy the diversified requirement, can save time and improve the experiment efficiency.