The invention relates to a cyclohexane oxidation reaction device and a cyclohexane oxidation reaction method. The device comprises N reactors, wherein N is more than or equal to 3; the lower end of each reactor is provided with a liquid inlet; built-in membrane modules are arranged inside each reactor; an oxygen-containing gas inlet is arranged on the built-in membrane module; one side of the upper part of each reactor is provided with an overflow port; the overflow port of the one reactor is connected with the liquid inlet of the latter reactor through an overflow pipe; the top end of each reactor is provided with a tail gas exhaust port. The method comprises the following steps: injecting cyclohexane into a first reactor to ensure that the upper part of each reactor is in an overflow state, continuously injecting the cyclohexane, raising the temperature and boosting the pressure of each reactor, introducing an oxygen-containing gas through the built-in membrane module, and performingoxidation reaction. The invention also discloses a reaction device provided with an externally hung membrane component and a method. The device is simple, easy to operate and low in cost; according to the method, the total yield of the cyclohexanone and cyclohexanol can be improved by more than 6%, and the production capacity can be improved by more than 10%, and the device is suitable for industrial production.