The invention relates to a suspension device which comprises a body, a power source, a master controller, a sensor, a load power source interface, a load communication interface and load space. The power source, the master controller, the sensor, the load power source interface, the load communication interface and the load space are arranged in the body. An experiment load is installed in the load space, and the purposes that power is supplied to the experiment load by the power source, and the experiment load is communicated with the master controller are achieved through the load power source interface and the load communication interface. The sensor collects and sends suspension device information into the master controller to be processed. The invention further discloses a microgravity experiment method which includes the steps that the scientific experiment load is installed in the load space; the suspension device is arranged in a space capsule, a release gear is used for performing releasing freely at the minimal initial speed, and when the suspension device is in a complete weightlessness state, a scientific experiment is started; the scientific experiment load is recycled, and the suspension device is stopped in a stopping platform to be fixed and charged. According to the suspension device and the microgravity experiment method, the complete space in the capsule and astronaut resources are fully utilized, achieving is easy, cost is low, and a high microgravity level can be reached.