A dry-wet cycle testing device capable of monitoring moisture content of soil in real time comprises a drying tank, a saturation tank, a power supply tank, a rotating device and a reading control device, wherein the drying tank promotes drying of soil samples by means of fans and a blower; the saturation tank performs humidification saturation on the soil samples by means of a humidifier; the power supply tank is located at the bottom of the device; the rotating device is divided into a self-rotating device and an around-circular-ring-track rotating device; the reading control device monitors the moisture content of the soil samples in real time. The dry-wet cycle testing device has the advantages that dry-wet cycle can be performed on the multiple soil samples with different water content ranges simultaneously, saturation and drying are more uniform by means of the special rotating device in the dry-wet cycle process, the moisture content of the soil samples can be monitored at any time, indication lamps can be lightened when preset moisture content is reached, and the dry-wet cycle on the soil samples is performed precisely.