The invention relates to a biological sludge harmless and resourceful treatment method. A biological sludge drying and incineration cycle-treatment method comprises the following steps: 1) sludge drying treatment process: adding backflow drying sludge into biological sludge, fully stirring and drying by sending the sludge into a rotary sludge drier; 2) dried sludge incineration treatment process: sieving part of dried sludge after the drying treatment, incinerating the sludge by sending the sludge into a boiling-type sludge incinerator, directly introducing high temperature flue gas generated by the incineration into the rotary sludge drier so as to dry mixed sludge; introducing exhaust gas generated by drying and incineration of sludge into an exhaust gas washing tower, introducing exhaust gas which has undergone washing treatment back into the boiling-type sludge incinerator to be incinerated, and carrying out harmless treatment on residual exhaust gas; and 3) simultaneously carrying out the above biological sludge drying treatment process and dried sludge incineration treatment process and ceaselessly cycling the processes. Biological sludge drying and incineration cycle-treatment complete equipment comprises the rotary sludge drier and the boiling-type sludge incinerator.