Reverse circulation valve capable of being opened and closed repeatedly

The invention relates to the technical field of oil well flushing equipment, in particular to a reverse circulation valve capable of being opened and closed repeatedly, which comprises an upper joint, a spring seat, a valve body, a piston and a pressure spring. The device is reasonable and compact in structure and convenient to use, when flushing fluid operation is carried out, hot flushing fluid is introduced into an annulus firstly, the hot flushing fluid is filtered by a filter pipe and then enters a third straight hole through a fluid inlet, and then the hot flushing fluid can push a sealing ball and a piston upwards to compress a compression spring to open a fluid through groove; hot well flushing fluid can firstly enter the valve hole through the fluid passing groove, then enter the oil pipe and finally return to the ground along the oil pipe, after well flushing operation is completed, the sealing ball and the piston seal the fourth straight hole again under the action of self weight and restoring forc