NOVELTY - Comprehensive utilization of garden waste comprises (i) separating more than 1.5 cm diameter branches and less than 1.5 cm diameter branches, leaves and flowers into two groups; (ii) carbonizing branches, leaves and flowers to obtain carbon-based charcoal fertilizer, and then carbonizing more than 1.5 cm diameter branches to obtain charcoal and crushed carbon residue; (iii) processing flue gas produced in carbonization to obtain wood vinegar, wood tar and wood coal gas; (iv) fermenting and composting the carbonization products; and (v) filtering, sieving, and packaging.    USE - The method is useful for comprehensive utilization of garden waste (claimed).    ADVANTAGE - The organic fertilizer has nutrient content of more than 5%, organic substance content of more than 60%, moisture content of 30-40% and biological carbon content of 10-25% (claimed). The method increases complete utilization of garden resources, achieves zero discharge, and has good economic and social benefits.    DETAILED DESCRIPTION - Comprehensive utilization of garden waste comprises (i) separating more than 1.5 cm diameter branches and less than 1.5 cm diameter branches, leaves and flowers into two groups; (ii) cutting the diameter more than 1.5 cm branches into section of 20-30 cm length, placing less than 1.5 cm diameter branches, leaves and flowers into a carbonization kiln and carbonizing for 1-2 days by controlling oxygen amount to obtain carbon-based charcoal fertilizer, and then carbonizing more than 1.5 cm diameter branches for 4-6 days to obtain charcoal and crushed carbon residue; (iii) conveying flue gas produced in the carbonization into a special flue gas recovery device, recovering and disposing, condensing in a condensing system, where the recovered liquid is mixed liquid of wood vinegar and wood tar, pumping the recovered liquid into a stratification tank, placing statically and layering, and separating and purifying using a separation and purification device to obtain wood vinegar with 15-30% yield, wood tar with 5-10% yield and wood coal gas with 150-250 cm3/ton yield; (iv) crushing carbon-based charcoal fertilizer into 10-20 meshes, conveying into a ferment groove, high temperature fermenting and composting under mechanical stirring, adding 60% wood vinegar when the moisture content is less than 50%, stirring and mixing crushed carbon residue and wood vinegar, adjusting moisture content to 40-60% and pH to 7-9, adding into fermentation heap accounting for 15-40% of the total amount of compost, inoculating fermentation strain and lignin decomposition bacteria, and fermenting at 60-70 degrees C for 15-30 days; and (v) filtering the fermentation powder, sieving, continuously fermenting the crude particles and directly packaging the sieving powder to obtain organic fertilizer.