Knife rest for automatically cutting light bricks and conveying belt matched with knife rest for feeding

The invention provides a knife rest for automatic cutting of light bricks and a conveying belt matched with the knife rest for feeding, the knife rest comprises cutting knife sets arranged on the upper side and the lower side in a lifting mode, each cutting knife set is formed by combining two cutting blades, and the two sides of the upper cutting knife set and the two sides of the lower cutting knife set are further connected with wire cutting wires through guide wheel mechanisms correspondingly; the wire cutting wires on the two sides tightly abut against the two sides of a green brick, wire cutting grooves are formed in the two sides of the green brick through reciprocating lifting motion, and the wire cutting wires on the two sides are located at the 1/2 position of a cutting gap with the interval being L; the cutting portions on the upper side and the lower side move away from each other to promote the green bricks to be broken around the cutting grooves and the wire cutting grooves, the cutting grooves