Rock test block centering fixing and fragment collecting device for point load test

The utility model relates to a rock test block centering fixing and fragment collecting device for a point load test, which comprises a telescopic circular bearing box for placing a rock test block in the middle, the bearing box comprises a top plate, an upper half box, a lower half box and a bottom plate, the upper half box is connected with a bearing pillar of a point load instrument through a semicircular clamping groove and a component thereof, and the lower half box is connected with a lower half box; the diameter of the top plate connected with the upper half box is larger than that of the semicircular clamping groove, the lower half box is contained in the upper half box and connected with the bottom plate, and the middle of the bottom plate is provided with a protruding circular object placing table, and when a rock test block is placed in the middle of the object placing table of the bottom plate, the elastic net cover covers the rock test block and is fixed to the wall of the lower half box through