Seat armrest

The utility model discloses a seat armrest which comprises an armrest horizontal supporting part and an armrest vertical supporting part which are used for supporting hands or arms, the upper end of the armrest vertical supporting part is fixedly connected with the armrest horizontal supporting part, and the lower end of the armrest vertical supporting part is fixed on one side of a seat. The handrail horizontal supporting part comprises a pushing cover plate, a pushing base fixedly buckled with the pushing cover plate, and a pushing plate arranged between the pushing cover plate and the pushing base; teeth are arranged on one side in the pushing base, and a wavy spring piece matched with the teeth is arranged on the lower end face of the pushing plate. The pushing plate is fixed to the vertical handrail supporting part through a connecting piece movably penetrating through the bottom of the pushing base, and the bottom of the pushing plate is connected with the bottom of the pushing base in a sliding mode. T