The invention provides a biomass jet-fired multi-pipe steam boiler and belongs to the technical field of boilers. The biomass jet-fired multi-pipe steam boiler comprises a boiler body, a biomass burning device, a water inlet pipe, an air outlet pipe, a smoke exhaust pipe, a draught fan, a solenoid valve and a controller. According to the biomass jet-fired multi-pipe steam boiler, the boiler body is arranged and used for generating steam; the biomass burning device is arranged and used for providing heat. With biomass fuel as an energy source, marketing of straw is promoted, economic income of farmers is increased to some extent, and the environmental problem caused by burning of straw is avoided. In hard-to-reach regions, local materials can be adopted as fuel of the biomass jet-fired multi-pipe steam boiler, and influence caused by energy shortage can be avoided.