The invention discloses an infinite stage type sectional cracking method for a sleeve. The method comprises the steps of 1) lowering down a sleeve well cementation pipe column; 2) lowering a service tool to an artificial bottom of a well; 3) lifting a continuous oil pipe, and positioning an infinite stage slide sleeve at the bottom layer through a mechanical looping positioning device; 4) downing and sealing a repeatable downing and sealing releasing tool into the infinite stage slide sleeve at the bottom layer and positioning between an upper through hole and a lower through hole; 5) cracking; performing annular pressing after the repeatable downing and sealing releasing tool is completely downed and sealed, pushing a piston to move downwards and blocking on a locking ring, opening the infinite stage slide sleeve, and adding sand to crack; 6) lifting the continuous oil pipe after cracking, and releasing the repeatable downing and sealing releasing tool; 7) sequentially upwards positioning an infinite stage slide sleeve 2 by the method in step 3); 8) repeating steps 4) to 7) until the whole well section is cracked. With the adoption of the method, the construction cycle can be greatly reduced; the cracking efficiency can be increased; the construction cost can be decreased.