The utility model provides a double-track book automatic punching machine which is provided with a paper feeding mechanism, a paper feeding mechanism, a punching mechanism and a paper discharging mechanism which are sequentially connected and matched to form a book conveying track, and the processes of paper feeding, punching and paper collecting are completed. Wherein a paper holding mechanism capable of sliding back and forth in a reciprocating manner is arranged between the paper mechanism and the paper feeding mechanism; two stacks of paper are input into the paper feeding mechanism through a paper measuring head of the paper holding mechanism and clamped and conveyed by the paper feeding mechanism, the problems of double-rail paper feeding page sliding and deflection are solved, synchronous feeding of the first side rail and the second side rail is achieved, synchronous punching of the two stacks of paper is achieved through one set of punching machine, and the working efficiencyof the automatic punching machine for the book is greatly improved.