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As a new vector insect of pine wood nematodes in China, the <i>Monochamus saltuarius</i> (Coleoptera: Cerambycidae) vectors pine wilt nematodes into healthy pine trees through feeding and oviposition, resulting in huge economic losses to forestry. A promising control strategy is to develop safe and efficient attractants. This study aims to screen for the key active volatiles of <i>Pinus koraiensis</i> (Pinales: Pinaceae), <i>Pinus tabuliformis</i> (Pinales: Pinaceae), and <i>Picea asperata</i> (Pinales: Pinaceae) that can attract <i>M. saltuarius</i>, and to study the synergistic attraction of the main attractant plant volatiles with ethanol and insect aggregation pheromones. The preference of <i>M. saltuarius</i> for three hosts is <i>P. koraiensis</i> > <i>P. tabuliformis</i> > <i>Picea asperata</i>. We detected 18 organic volatiles from three host plants. Through EAG assays and indoor Y-tube behavioral experiments, 3-carene, (-)-camphor, β-pinene, α-phellandrene, terpinolene, α-pinene, D-limonene, and myrcene were screened to have attractive effects on <i>M. saltuarius</i>. We found that 3-carene, β-pinene, and α-pinene are the most attractive kairomones in field experiments, which may play a crucial role in the host localization of <i>M. saltuarius</i>. Ethanol has a synergistic effect on the attractant activity of 3-carene and β-pinene, and the synergistic effect on β-pinene is the best. The mixture of ethanol, 2-undecyloxy-1-ethanol, and ipsdienol can significantly enhance the attraction effect of β-pinene on <i>M. saltuarius</i>. These new findings provide a theoretical basis for the development of attractants for adult <i>M. saltuarius</i> and contribute to the green control of <i>M. saltuarius</i>.