The invention provides a dynamic two-dimension code generation method based on algorithm reconstruction. The dynamic two-dimension code generation method based on the algorithm reconstruction comprises the following steps: S1) a server generates and stores a key parameter uniquely associated with user information; S2) a first client side sends the user information and first information to the server; S3) the server calls the key parameter uniquely associated with user information according to the user information, and the key parameter is combined to generate a first algorithm; S4) the server converts the first information to second information according to the first algorithm; S5) the server coverts the second information into a two-dimension code image and sends the two-dimension code image to the first client side for displaying. According to the dynamic two-dimension code generation method, an encoding algorithm and a decoding algorithm of a two-dimension code data code are reconstructed to cause the two-dimension code to be under a state of dynamic change, and the safety of the two-dimension code in a use process is guaranteed.