Concrete stone crusher

The utility model relates to the technical field of concrete processing devices, in particular to a concrete stone crusher which comprises a crushing table, the upper end of the crushing table is coaxially and fixedly connected with a protective cover, the upper end of the crushing table is fixedly connected with two vertical rods which are symmetrically arranged left and right, the two vertical rods are in vertical sliding fit with a connecting plate, and the upper ends of the two vertical rods are fixedly connected with a bracket. A lifting device is directly arranged between the bracket and the crushing table and drives a longitudinally arranged sleeve, an insertion rod is coaxially and slidably matched with the inner wall of the sleeve, a spring is fixedly connected to the rear end of the insertion rod, and a first wedge-shaped rod which is longitudinally arranged and is in contact fit with the lower end of the connecting plate is fixedly connected to the upper end of the guide strip; the upper end of the