The invention discloses a vertex-aligning buttress balancing plate type cutting supporting block device, which comprises supporting block walls and an inter-wall top beam, wherein the supporting block walls are respectively arranged on the two sides of a road and extend along the direction of the road; the inter-wall top beam is arranged between the two opposite supporting block walls; each of the supporting block walls comprises a block wall panel and a beam type balancing plate, and the beam type balancing plate is arranged on the outer side of the block wall panel and is vertical to the block wall panel; a slope type wall heel is arranged at the bottom of each block wall panel; each slope type wall heel comprises a wall heel and a wall toe plate, the wall heel is arranged at the bottom of the block wall panel, and the wall toe plate is arranged on the inner side of the bottom of the block wall panel and is vertical to the block wall panel; the two ends of the inter-wall top beam are respectively resisted against the wall toe plates of the supporting block walls on the two sides of the road. The vertex-aligning buttress balancing plate type cutting supporting block device provided by the invention can be used for reducing the on-site labor intensity, improving the operation condition, increasing the environmental protection effect and reducing the engineering cost.