The invention discloses a multi-purpose chair, which comprises chair legs and a seat plate, wherein the seat plate is arranged on the chair legs; and one end of the seat plate is connected with a backrest. The multi-purpose chair is characterized in that a cavity is formed in each of the seat plate and the backrest; an electric blanket used for heating the upper surface of the seat plate is arranged in a position, near the upper surface of the seat plate, in the cavity of the seat plate; a switch push button used for controlling the on-off state of the electric blanket is arranged at one side of the outer surface of the seat plate; a water bag used for storing cold water is arranged in the cavity of the backrest; a water injecting hole is formed in the upper part of the water bag; a water discharging hole is formed in the lower part of the water bag; and a hole plug is arranged in each of the water injecting hole and the water discharging hole. In summer, cooling water can be replaced for lowering the temperature for a user; in winter, the electric blanket is used for warming a customer; and many requirements of office workers in modern society can be met. The multi-purpose chair has the advantages that the structure is simple; the design is reasonable; the use and the operation are convenient and fast; the practicability is high; and the popularization and the use are convenient.