The utility model relates to an electronic lock comprising a lock cylinder, a lock liner and a key, wherein a pin tumbler hole is arranged on the lock cylinder, a pin tumbler is arranged in the pin tumbler hole, and a key jack into which the key is inserted is arranged on the lock liner. The electronic lock also comprises a control circuit, a power supply and a button switch, wherein one end of the control circuit is connected with one pole of the power supply, the other end of the control circuit is connected to the other pole of the power supply by the button switch, the button switch is installed in the lock cylinder, and the switching position of the button switch corresponds to the position of a keyhole, so that the button switch can be closed when the key is inserted into the keyhole; by the button switch, the electronic lock disclosed by the utility model realizes that when the key is inserted into the keyhole, the system is electrified, the control circuit starts working, and the function of the electronic lock is finished; moreover, the power supply is switched off after the key is pulled out of the keyhole and the corresponding operation of the system is finished; therefore, compared with a traditional electronic lock, the electronic lock is only electrified for working within the necessary time; and furthermore, under the condition that the electronic lock is not needed, the power supply is switched off, so that the power consumption of the electronic lock is greatly lowered, the power supplying mode is more reasonable, and a battery can be directly adopted for supplying power.