Two-wavelength laser fuze detection principle was expounded and a new technical approach was invented for laser fuze anti-surf and target-recognition by the character of echo between infrared and blue-green laser was different observably when two-wavelength laser exposured sea and the character of echo between infrared and blue-green laser was similar when two-wavelength laser exposured the target. Laser transmitter system of two-wavelength laser fuze transmitted two kinds band laser of infrared and blue-green at same time, receiving system received echo signal of two kinds band by two detectors, information processing system acquisited echo signal with high-speeds and realtime to acquire the range, pulse width and laser echo ratio and so on, using this information to distinguish sea and target. The prototype of two-wavelength laser fuze was designed, and the different objectives test in the sea by the prototype was done. The result of test show that the effect of two-wavelength laser fuze anti-surf is favourable.