A safety interlocking device for a switch includes a supporting member, an annular member, a locking lever, a limiting rod and a resilient member. A driving shaft of the switch is arranged through the supporting member and the annular member, the annular member rotates synchronously with the driving shaft, and the annular member is coupled to a wing block. The locking lever is hooked onto the safety device, the limiting rod is rotated when pushed by the safety device, and the rotation of the limiting rod rotates the locking lever. When the safety device is closed, the switch is turned on and 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.