The invention discloses an open circuit protection circuit, an open circuit protection method and a lighting device. The open circuit protection circuit is used for a device provided with an LED load, wherein a current source supplies electricity to the LED load. The open circuit protection circuit comprises a switch circuit, a timer circuit and a detection circuit, wherein the switch circuit is connected to two sides of the LED load in parallel; the timer circuit is connected to the switch circuit; the detection circuit is connected to the timer circuit and used for detecting the open circuit state of the LED load. When the LED load breaks down and is in an open circuit state, the open circuit protection circuit operates in the following steps that the detection circuit sends a starting signal to the timer circuit, the timer circuit sends a driving signal with set time to the switch circuit, and the switch circuit enables the LED load to be in a short circuit state in the set time. The open circuit protection circuit can return to normal after faults are eliminated; when multiple LED loads all make poor contact with the circuit or the LED loads are not connected with the circuit, the circuit can also be prevented from being damaged, and meanwhile power consumption of the open circuit protection circuit is relatively low.