A multifunctional plastic property testing apparatus comprises a first base (1). A position-limiting and fixing device is provided on the first base (1), and comprises a first fixing plate (3). Position-limiting holes (18) are provided on the first base (1). A first holding plate (2) is provided above the position-limiting holes (18). A second holding plate (4) is disposed opposite to the first holding plate (2). A second fixing plate (5) is provided on the right side of the second holding plate (4). A power device is provided on a side of the second fixing plate (5) located away from the second holding plate (4). A test device is provided on the right side of the position-limiting and fixing device. A first vibration reduction device is disposed below the first base (1), and comprises a vibration reduction container (19). A second vibration reduction device is disposed below the vibration reduction container (19). The position-limiting and fixing device is used to tightly hold a plastic material, the test device is used to test main physical properties of the plastic material, and the vibration reduction devices provide protection to the apparatus. The apparatus has a simple structure, is easy to operate, has good applicability, and can be used to test plastic materials of different sizes.