The utility model discloses an emergency traffic indicating device convenient to fold and unfold. The device comprises a fixing base, a second fixing block and an indication board, a first motor is installed in the fixing base, one end of the first motor is connected with a first threaded rod, one side of the first threaded rod is sleeved with a first sliding block, and a first fixing block is fixed to the end, away from the first threaded rod, of the first sliding block. The emergency traffic indication device convenient to fold and unfold is provided with the first threaded rod which can rotate through the first motor; the first threaded rod rotates to drive a first sliding block to slide in a threaded manner; when sliding, the first sliding block pushes the first fixed block and the fixed groove to slide; the first fixing block slides to push the semicircular clamping block and the second fixing block to extrude at the same time, the semicircular clamping block extrudes the first spring at the same time, when the semicircular clamping block is extruded into the fixing groove, the semicircular clamping block can be clamped with the clamping groove, and the device can be conveniently and rapidly installed.