Crushing device of top coal caving hydraulic support

The invention provides a crushing device of a top coal caving hydraulic support. The crushing device of the top coal caving hydraulic support comprises a base, an ejecting beam, a front telescopic stand column and a rear telescopic stand column, and further comprises an ejecting block device; the ejecting block device comprises a front telescoping ejecting column, a rear telescopic ejecting column, crushing plates at the upper end of the front telescopic ejecting column and the upper end of the rear telescopic ejecting column, wherein a crushing groove located in the middle is arranged at theupper end of the ejecting beam, a front ejecting column sleeve ring and a rear ejecting column moving groove are arranged in the crushing groove, the bottom end of the front telescoping ejecting column is fixed on the base, the telescoping end of the upper end of the front telescoping ejecting column is installed at the front ejecting column sleeve ring, the bottom end of the rear telescopic ejecting column is fixed on a