Because of the complexity of space light environment, suppressing stray light is particularly important to ensure the imaging performance of space cameras. The stray light analysis and suppression optimization design were carried out for the optical system of the space probe camera for wide-band imaging. The optomechanical model was established through the lossless data interaction between SOLIDWORKS and TracePro, and the stray light model was optimized from the surface characteristics, mechanical structure, lens transmittance and other aspects of the optomechanical material. Then, the forward and reverse directions were traced by the Lambert body light source, and the key surfaces of the system were sampled and analyzed in combination with the half-section diagram of the optomechanical model. The analysis results show that the point source transmittance of the optimized optomechanical system at the off-axis angle of 10.3°~15.4° decreases by 66%~99.4% compared with that of the original system. The point source transmittance at the off-axis angle of more than 14.2° is close to the order of 10^-4, and the point source transmittance of stray light at the off-axis angle of 18.4° is about 10^-4. The ghost image experiment further proves that the optimized design of optomechanical system has good stray light suppression effect.