The invention relates to a modification method of a SAPO molecular sieve, mainly aiming at solving the problem of poor performance of the SAPO molecular sieve in the prior art. The invention comprises the following steps: (1) the raw powder of the SAPO molecular sieve is calcined at a high temperature to remove all or part of the template; (2) a metal salt solution and the molecular sieve prepared in the step (1) are mixed; (3) the mixture prepared in the step (2) reacts for 0.1-8 hour at the temperature of 80 to 400 DEG C; (4) the technical proposal of molecular sieve recycle better solves the problem and can be used in preparing olefin catalyst by oxygenated compounds.