The invention relates to the technical field of biomass fuel, in particular to platycladus orientalis, pine needle and pseudo-ginseng composite biomass fuel and a preparation method thereof. Raw materials mutually produce a microcosmic effect in the mixing process by using platycladus orientalis, pine needles, pseudo-ginsengs and a straw fermentation product as the raw materials to design proportioning, modification treatment on the biomass ingredients in the raw materials is achieved, especially the raw materials including the platycladus orientalis, the pine needles, the pseudo-ginsengs and the like are added into the straw fermentation product so that the raw materials can be well adhered together and the platycladus orientalis, the pine needles and the pseudo-ginsengs can be also softened under the effect of the straw fermentation product. The tightness of the prepared granular biomass fuel is improved, the compactness of the biomass fuel is improved, and the quality of the biomass fuel is improved. The granule forming density of the granular biomass fuel is 1.25 T/m<3>, the length of granules is 4 cm, the diameter of the granules is 0.8 cm, the moisture content is 12%, and the percent of pass is 93.5%.