A maintenance order adjustment system (1) for textile machinery includes: one or more first textile machines (2, 2A, 2B, 2C) each configured to perform a first process on a first fiber assembly, a plurality of second textile machines (3, 3A, 3B, 3C) each configured to be supplied with a second fiber assembly (B) subjected to the first process by the first textile machine (2, 2A, 2B, 2C) and perform a second process on the supplied second fiber assembly (B) to generate a third fiber assembly (P) ; an operation information acquisition unit (52a) configured to acquire operation information representing an operation state of the first textile machine (2, 2A, 2B, 2C) ; an order setting unit (52c) configured to determine a maintenance order in performing maintenance on the second textile machines (3, 3A, 3B, 3C) based on a preset order and adjust the determined maintenance order based on the operation information acquired by the operation information acquisition unit (52a); and a presentation unit (51) configured to present the maintenance order adjusted by the order setting unit (52c).