Modern aircraft is equipped with airborne photoelectric detection system. Infrared thermal imager is used to search the azimuth of aircraft target in airspace, and pulsed laser rangefinder is used to measure the radial distance of target. Airborne pulsed laser target detection is a dynamic process. When the light spot moves on the target or the atmospheric turbulence refraction causes the echo beam to deviate from the receiving antenna, sometimes the target is absent, which makes it impossible to track the target stably. Only the amplitude information of target echo pulse is used to detect, which limits the effective range of laser target. In the dynamic clutter background of airborne platform, the problem of dynamic target detection can be solved by considering the pulse laser target as the range extended target and the echo signal as the target waveform image. In view of this, a multi pulse laser range extended target echo filtering algorithm based on wavelet transform was proposed. Experimental results show that the proposed algorithm can keep the waveform characteristics well.