The invention relates to accessories of toilet bowls, in particular to a dual-purpose child and adult toilet seat cover, aims to solve the problem that an existing toilet seat cover with the structure of a female washer and a male washer is not sanitary when being used by an adult, and provides a toilet seat cover of a toilet bowl which can be sanitarily and cleanly used by children and adults. The toilet seat cover comprises a female washer and a male washer, the male washer is positioned above the female washer, the female washer and the male washer are pivoted on a toilet bowl, a female through hole is formed in the female washer, the male washer includes a rear male washer and a front male washer, the front male washer is pivoted on the toilet bowl, the rear male washer is pivoted on the front male washer, and a water spraying hole is communicated with an outlet of a water inlet pipe.