The invention relates to the test for the pulse laser energy and discloses a device for testing pulse laser energy and a measuring method. The device comprises a laser energy probe, an A/D conversion circuit, an amplifying circuit, a micro controller, a three-position seven-section display and a layer wavelength switching key. The method comprises the steps of: 1) designing a parameter of the amplifying circuit, 2) testing a sample value cycle program, and 3) processing the sample value and displaying the procedure. The invention has the advantages of convenient use, simple structure, low cost and portability. The device can be used for calculating the laser energy and for the cooperative production of the matched laser device.