Simultaneous multi-wavelength pulsed laser is achieved in dual-end-pumped composite laser slab composed of Nd:YLF and Nd:YAG crystals. As much as 6 mJ of laser output at 1064 nm and 1053 nm wavelengths is obtained with an incident pump pulse energy of 40.5 mJ at 500 Hz repetition rate, corresponding to an optical-optical conversion efficiency of 14.8%. By inserting a LBO crystal in the cavity, three green wavelengths of 526.5, 529.0 and 532.0 nm lasing is detected simultaneously. The total pulse energy is about 3.6 mJ under 40.5 mJ of incident pump pulse energy at 500 Hz repetition rate. The optical-optical conversion efficiency is 8.9%. The beam quality factors are M2x=1.61, M2y=1.25.