The invention provides a sewage-and-sludge quick drying method for breeding spirulina. The method comprises the following steps: building sewage-and-sludge quick drying devices; fully soaking the plurality of devices into a sewage-and-sludge tank for more than 5 minutes; then taking the devices out of a sewage surface and draining off; air-drying; dropping sludge blocks on the devices in a drying process; collecting the dropped sludge blocks and further airing; repeatedly soaking and air-drying until the sludge in the sewage-and-sludge tank is totally collected and aired. Compared with a conventional sludge treatment method, the sewage-and-sludge quick drying method for breeding spirulina has the advantages that the sewage-and-sludge tank with the size of 200 cubic meters needs to be treated for only 5-10 days while the sewage-and-sludge tank with the size of 200 cubic meters is treated for 45 days in a conventional method, so that the drying efficiency of the sludge can be greatly improved. The method is simple and convenient to operate. By adopting a mechanical and physical method, the sewage-and-sludge quick drying method is suitable for manufacturers in remote areas, the energy consumption is reduced, and other facilities are not needed; moreover, the medicaments are not used, and the environment is not influenced.