A device for improving recovery of sinter cooling waste gas and waste heat comprises a sintering machine. A single-roll crusher is arranged below the outlet end of the sintering machine. An energy accumulator is arranged below the discharging end of the single-roll crusher. The bottom end of the energy accumulator is connected with a cooling machine. At least one hot wind collection gas hood is arranged on the cooling machine. The hot wind collection gas hoods are connected with a hot wind collection pipe. The outlet end of the hot wind collection pipe communicates with the upper portion of a waste heat utilization device. The lower portion of the waste heat utilization device is connected with an air cooler through a circulating pipeline. By the adoption of the device for improving the recovery of the sinter cooling waste gas and waste heat, the energy storage capacity of sinter is improved, material distribution of a material distributor is more even, a good condition is provided for sintering waste heat utilization, the problem that efficient recovery of the hot sinter cooling waste gas and waste heat is difficult to stabilize under the working conditions that the yield of sinter is unstable and the sintering yield is lower is solved, and the energy consumption of the sintering process is lowered greatly.