The invention discloses a scanning-printing integrated machine for lottery ticket printing and cashing, comprising a first passage connected with an external paper inlet, a second passage connected with a paper house, a third passage connected with a paper outlet, and a control device, wherein a paper outlet of the first passage and a paper outlet of the second passage meet together at the third passage, at least one pair of delivery rollers is arranged in the first passage, a first printing mechanism and a paper cutting mechanism are arranged in the second passage, a scanning mechanism and a second printing mechanism for printing mark information on a medium are in sequence arranged in the third passage, wherein the control device judges the validity of the medium according to medium images collected by the scanning mechanism, and controls the printing operation of the second printing mechanism according to the judgment result. The scanning-printing integrated machine of the invention can not only achieve printing and cashing of the lottery tickets, but also detect the integrality of the printed contents.