The invention discloses a contract printing guarantee method, comprising the following steps: S1, preparing: selecting a printing device and importing the contract file into the printing device; S2: obtaining the total page number of the contract: reading the total page number of the contract document, recording it as A and adding printing paper to the printing equipment; 3, obtaining a variable X, and setting X=0; S4: printing the contents of page 1 + X in the printed contract file by the printing device described in S1; S5: reducing the contents of page 1 + X in the contract document and write it down as reduce document M; S6: merging contents of page 2 + X in the contract document and the reduced file M described in S5 in the same file and recorded as the printed file N. The invention has reasonable design and high practicability, and can reduce the proportion of the content of the previous page of the contract and print to the bottom of the next page when printing, so as to realizethat the content of the next page and the content of the previous page in the contract coexist on the same page printing paper, thereby increasing the integrity of the contract.