A safety interlocking device for a switch is disclosed. In at least one embodiment, the safety interlocking switch includes a supporting member, an annular member, a locking lever, a limiting rod and a resilient member. A driving shaft of the switch can be arranged through the supporting member and the annular member, the annular member can be rotated synchronously with the driving shaft, and the annular member is further provided with a wing block. The locking lever can be hooked onto the safety device of the switch, the limiting rod can be rotated when pushed by the safety device, and the rotation of the limiting rod can make the locking lever rotate. When the switch is turned on, the locking lever hooks onto the safety device so that the latter cannot be opened; and when the switch is turned off, the locking lever releases the safety device, while one end of the limiting rod limits the rotation of the annular member, thus limiting the switch's turn-on operation. Only when the safety device is closed, can the switch carry out the turn-on operation. The safety interlocking device of at least one embodiment of the present invention is simple in structure and easy to produce, and it not only ensures the locking of the safety device when the switch is turned on, but also ensures that the switch cannot be turned on when the safety device is open, thus realizing overall protection.