An adjustable slide latch device has a slide track unit comprising an outer track and an extendable and retractable inner track held in the outer track, both are collectively provided with (a) a stopper device comprising a stopper piece and an adjustment piece and (b) a limit piece at laterals: the stopper piece disposed at the surface of the inner track comprises base parts which are fixed on the inner track and have (1) equidirectional-extended support arms at both laterals on which there are thrust blocks at rear ends and (2) positioning parts between two support arms; the adjustment piece which is disposed at the stopper piece's other lateral away from inner track and has a pivot part joining the positioning parts can drive two support arms during rotation to adjust space between thrust blocks at two support arms' rear ends and change forces to open and close a drawer.