Provided are a washing machine siphon cap (101), a washing machine detergent box assembly and a washing machine. The washing machine siphon cap (101) comprises a siphon cap body (1), wherein an elastic structure (2) is provided on the siphon cap body (1), the elastic structure (2) is provided with a protrusion structure (3) protruding from the elastic structure (2), the elastic structure (2) is arranged to protrude from the siphon cap body (1), two ends of the elastic structure (2) are respectively connected to the siphon cap body (1), and the elastic structure (2), under the action of an external force, is elastically deformed to drive the displacement of the protrusion structure (3). The washing machine siphon cap (101) can reduce the plastic deformation caused by pressure and fatigue to the maximum extent, can avoid the occurrence of the pulling-white phenomenon on the siphon cap (101) at the same time, prolongs the service life of the siphon cap (101), prevents a detergent box (102) from freely releasing, and avoids the waste of a laundry treatment agent.
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