In order to simulate the laser threat in complicated condition, a new type of laser source with combined multi-wavelength and multi-coding beam out was presented. Three wavelengths of 650 nm, 808 nm and 905 nm were adopted here. The microcontroller STC8H was selected as core of the coding module to modulate laser beams. By dichroic mirrors, three channel lasers were combined to one channel laser output. And relevant theoretical analysis and simulation verification were carried out. The results show that the energy of pulse laser is up to 2.45 mJ, the diameter of beam is 6 mm. It can modulate laser driving signal in the precise frequency coding, the variational duty cycle coding and the variational space coding. The precision of frequency and duty cycle are 0.5 Hz and 0.1%. The device can provide laser beam with different coding messages in different wavelengths. This research presents a new detection device of laser warning devices, which has reference for the improvement of detection.