A switching method and apparatus of an OLP transmission link of an optical fiber automatic switching protection system, a storage medium and an OLP. The method is used for at least one OLP in at least two OLPs connected in a cascading manner, and the least one OLP comprises a first input end used for receiving a first signal and a second input end used for receiving a second signal. The method comprises: obtaining first time information in which signal values of the first signal and the second signal are both less than respective first threshold values (S201); obtaining a first signal value of the first signal and a second signal value of the second signal within the period from the first time to the second time (S202); after a third time, at least obtaining a third signal value of the first signal (S203); and determining whether to switch the OLP from a first transmission link to a second transmission link according to the first signal value, the second signal value and the third signal value (S204).
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