A capping apparatus for a bottle filling device with a capping head main body; a first slide body is located on the capping head main body and can slide up and down; a capping door mechanism is hinged with the capping head main body and the first slide body; a cap sucking head can slide up and down; a middle slide body is arranged between the cap sucking head and the first slide body and can slide up and down; a first spring and a second spring; and a cap inlet chute. A capping system is equipped with a plurality of capping apparatus, the number of the capping apparatus is equal to that of columns of filled bottles, and the cap sucking heads of the capping apparatus are connected together through a connection structure with a mechanism that actuates the cap sucking heads to rise up and fall down.