The invention mainly relates to an anesthesia machine, which is formed by a frame, a gas delivery system, an anesthetic evaporator, a respiration loop, a respirator, a safety monitoring system and a waste gas scavenging system, wherein the gas conveying system, the anesthetic evaporator, the respiration loop, the respirator, the safety monitoring system and the waste gas scavenging system are arranged on the frame. An object storage drawer is arranged above the frame, the gas delivery system and the anesthetic evaporator are arranged above the object storage drawer and are connected with each other, and the anesthetic evaporator is connected with the respiration loop connected with the respirator. The safety monitoring system is arranged above the respiration loop, the waste gas scavenging system is further connected with the position below the respiration loop, and the safety monitoring system comprises a data acquisition unit, a communication unit and a computer. The anesthesia machine has a simple and reasonable structure, can monitor depth of anesthesia, improves safety and effectiveness of the anesthesia of patients, and is suitable for popularization and application.