• Dual-wavelength lasers are often used as light sources for sum-frequency systems. • Adjusting Q-switching delay is reported in a 1064/1342 nm Nd:YVO 4 Q-switched laser. • The simultaneous output of dual-wavelength laser is realized.. In this paper, an all-solid-state Nd:YVO 4 laser with peak synchronize output of 1064/1342 nm dual-wavelength Q-switched pulse is designed. Double-cavity structure with single Nd:YVO 4 crystal and double RbTiOPO 4 (RTP) electro-optic (EO) Q-switch is built. At repetition frequency of 10 kHz, taking the trigger time of EO Q-switch at 1342 nm as reference, at the delay time of EO Q-switch at 1064 nm as 1.3 μs, the pulse peak synchronize dual-wavelength laser is obtained, and the pulse power is 1.63 W and 1.63 W with the width is 55.64 ns and 105.2 ns respectively. The beam quality is M x 2 =1.61 , M x 2 =1.64 and M x 2 =1.43 , M y 2 = 1.54 , respectively. [ABSTRACT FROM AUTHOR]