Dual-purpose chair for sitting and standing

The invention provides a sitting and standing dual-purpose chair, which comprises a chair frame 1 and armrests 2 positioned on two sides of the chair frame 1 and connected with the chair frame 1, and is characterized by further comprising a seat part 3 rotationally connected with the chair frame 1, the armrests 2 comprise a first armrest 21 and a second armrest 22, one end of the first armrest 21 is connected with the chair frame 1 in a rotatable and lockable manner, the second armrest 22 is connected with the other end of the first armrest 21, and the first armrest 21 and the second armrest 22 are respectively used by a user in a sitting posture and a standing posture. A chair user can use the chair in a sitting posture and a standing posture, namely when the chair is in the sitting posture, the seat part 3 is kept horizontal, and the first armrest 21 is used; when the user stands, the seat part 3 is rotated to be vertical, and meanwhile, the second handrail 22 is rotated to be horizontal and is locked and k