The invention relates to a multifunctional rock core holder, which comprises cylinder bodies, end covers, a short rubber cylinder, a long rubber cylinder and a pedestal. The multifunctional rock coreholder is characterized in that: the cylinder bodies are in threaded connection with the end covers, and the end covers are in threaded connection with the plugs, two cylinder bodies are in threaded connection with horizontal connecting blocks at the ends of each other to compose a parallel connection body, the parallel connection body is internally equipped with the short rubber cylinder, the topis equipped with hollow plugs, and the hollow plugs are interconnected through pipelines. Two cylinder bodies are connected to the horizontal connecting blocks and vertical connecting blocks at the ends of each other simultaneously to compose a concatemer, which is internally equipped with the long rubber cylinder, and the cylinder bodies are connected by support plates through bolts, and plug screws are mounted at the tops of the cylinder bodies. Seal rings are disposed between the cylinder bodies and the end covers and the support plates, and the cylinder bodies cooperate with arc-shaped supports, the arc-shaped supports are connected to the upper ends of support rods through octagonal pins, and the lower ends of the support rods are connected to the pedestal through bolts. According tothe invention, the rock core parallel connection mode can simulate complex stratum conditions, at the same time connection of the cylinders in series or individual use can achieve clamping measurement of a combined long rock core or short rock core respectively, and the functions are diverse.