Laser processing real-time imaging device and method based on pulse alternating method

The invention discloses a laser processing real-time imaging device based on a pulse alternating method. The laser processing real-time imaging device comprises a laser processing unit, an illumination unit, a real-time microscopic imaging unit and a control unit, wherein the laser processing unit is used for emitting laser pulse and processing a workpiece by using laser when the laser pulse is at a high level; the illumination unit is used for generating illumination light and irradiating a workpiece processing area; the control unit is connected with the laser processing unit and the real-time microscopic imaging unit and is used for transmitting an image acquisition signal to the real-time microscopic imaging unit when the laser pulse of the laser processing unit is at a low level; and the real-time microscopic imaging unit is used for carrying out real-time microscopic imaging on the workpiece processing area under the control of the image acquisition signal and sending an acquired image to the control un