The invention provides a multifunctional treadmill. The multifunctional treadmill comprises a running table, a sealed gasbag, a tight-expanding part and pressure adjusting equipment, wherein the running table simulates a user running site through circulating rotation, the sealed gasbag wraps the running table, and an opening which is used for allowing the leg of the human body to extend into the sealed gasbag is formed in the portion, above the running table, of the sealed gasbag, the tight-expanding part is arranged at the opening of the tight-expanding part, and makes the opening sealed by squeezing the part which is in contact with the human body; at least partial structure of the pressure adjusting equipment is located in the sealed gasbag, and by compressing the air density in the sealed gasbag, the atmospheric pressure in the sealed gasbag is larger than environment atmospheric pressure. The sealed gasbag and internal pressure share partial gravity of the human body, when a user runs, the pressure in the leg of the human body is reduced, when the user runs and exercises for a long time, leg muscle proliferation cannot be caused, and the multifunctional treadmill can be loved and recognized by the user.