As a means of communication, laser communication is widely used in the military and civilian fields for its strong anti-interference ability, excellent confidentiality, and centralized optical power. Filter film is made to satisfy the requirements for laser communication systems and to improve the signal to noise ratio. Using Ti3O5 and SiO2 as coating materials, a three-band-pass and wide reflection band filter is designed according to the double frequency design and dual-wavelength anti-reflection principle. By using scale thickness and reverse engineering methods, the accumulative error is analyzed, and the problem of thickness monitoring error is solved. Transmittance of the filter is greater than 90% at 532 nm and 1064 nm, is higher than 85% at 808 nm, and is less than 0.4% at (1550± 20) nm, which meets environmental testing requirements of the communication system.