Meter for detecting plastic meter density

The utility model relates to the technical field of density instruments, in particular to a density instrument for detecting plastic meters, which comprises a density testing machine body, a testing table and a turning cover, the testing table is installed at the top of the density testing machine body, the flip cover is arranged at the top of the testing table, a button is inserted into the top of the testing table, the outer wall of the button is sleeved with a limiting ring, the limiting ring is fixedly connected into the testing table, the outer wall of the button is sleeved with a first spring, and a fixing rod is slidably connected into the testing table; according to the utility model, when the button is loosened, the button moves upwards through the first spring, the fixing rod is pushed to return to the original position through the second spring, the button is pushed to move upwards through the first spring, the button is pushed to move upwards through the second spring, and the button is pushed to