The invention discloses a rotational flow sand removing device which comprises an oil-gas well inlet and outlet device, a sand removing cylinder, a sand collecting cylinder and a differential pressure detecting device. The oil-gas well inlet and outlet device comprises an oil-gas inlet and an oil-gas outlet. The inlet end of the sand removing cylinder is connected with the outlet end of the oil-gas inlet. The oil-gas inlet is connected with the inlet end of the sand removing cylinder through an inlet pipeline and a first flat valve. The outlet end of the sand removing cylinder is connected with the inlet end of the oil-gas outlet. The oil-gas outlet is connected with the outlet end of the sand removing cylinder through an outlet pipeline and a second flat valve. The differential pressure detecting device is arranged between the oil-gas inlet and the oil-gas outlet. One end of a differential pressure gauge is connected with the oil-gas inlet. The other end of the differential pressure gauge is connected with the oil-gas outlet. The sand collecting cylinder is arranged at the lower end of the sand removing cylinder. A sand discharging pipeline and a flushing pipeline are arranged at the lower end of the sand collecting cylinder. According to the rotational flow sand removing device, solid particulate matter in fluid in a well can be effectively removed, damage to downstream ground equipment is reduced or avoided, the service life of test equipment is prolonged, and the operational safety is improved.