Abstract: An anti-backflow nasal aspirator, comprising: a housing, wherein a control assembly and a suction assembly are installed in the housing, and the suction assembly is opened or closed by the control assembly; a collection assembly, hermetically installed on the housing, and the collection assembly is hermetically docked with the suction assembly; the collection assembly is provided with a collection cavity; a suction nozzle, installed at the input end of the collection assembly; a diversion bracket, installed in the collection assembly. The nasal mucus is diverted through the diversion bracket to prevent the nasal mucus from entering the air passage and causing a short circuit of the main board, and through the structure of the joint between the diversion bracket and the collection cup mask, it can effectively prevent nasal mucus from diverting, which is more hygienic.