The invention discloses an anti-unhooking elevator sill assembly. The anti-unhooking elevator sill assembly comprises a sill body and a door sliding block. The sill body is provided with a sliding groove. The door sliding block is arranged in the sliding groove in a sliding fit manner. The sliding groove comprises a guiding groove, a limiting groove and an anti-disengaging groove. The door sliding block comprises a supporting plate, a limiting hook and an anti-disengaging hook. The guiding groove is in sliding fit with the supporting plate. The limiting groove is in sliding fit with the limiting hook. The anti-disengaging groove is in sliding fit with the anti-disengaging hook. According to the anti-unhooking elevator sill assembly, it can be guaranteed that a door plank does not disengage from a sill when deformed due to collisions; few inner cavities exist, the hollow degree is low, the bearing capability is high, the overall stability and safety of the structure are better enhanced, and the anti-unhooking elevator sill assembly is applicable to more elevators and is wide in application range, good in running stability and high in safety.