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Aiming at the problem of separation of the mixture of sintered bricks and concrete blocks in construction waste, this paper introduces the design of hardware and software of construction waste automatic sorting system based on color selection technology and its experimental verification.The system is based on the machine vision to get the center of mass of the target block on the conveyor belt, By writing the corresponding C++ algorithm program on the PC , using the OPC client /server mode and PLC (programmable logic controller) to communicate,so as to achieve real-time control of high-pressure air valve. In order to improve the real-time system, using a circular queue of data access mode. Finally,It is introduced that by calculating the center of coordinate of the target to achieve its precise timing and positioning. The experimental results show that the recognition rate is 96.8% and the separation rate is 91.7% when the conveyor speed is 1.00 m/s.The economic value of the efficient separation and recovery of sintered bricks and concrete blocks will be greatly improved, which will help solve the current environmental problems of the siege of solid municipal solid waste.