The invention discloses an injection micro-foaming device, and belongs to the technical field of machine equipment. The injection micro-foaming device comprises a bearing, a material barrel, a screw, a screw head, a frame, a linear motor, a movable block, a first supporting rod, a first air cylinder, a second supporting rod, a first push plate, a first push rod, a first press plate, a housing body, a controller, a spraying nozzle, a rubber ring, a leftward-thread lead section, a non-return valve, a gasket, a rightward-thread lead section, a machine shell, an anti-leaking ring, a first motor, a flow stop ring, a connecting rod, a second motor, a support, a nut, a lead screw, a bearing frame, an air inlet pipe, an air inlet valve, a feeding valve, a feeding inlet, a condensate water device, a compression tank, a second press plate, a second push rod, a second push plate, a second air cylinder, a desulfurizer, a dehydration device and an air storage tank. The air storage tank is connected with a smoke exhausting system of a factory through a pipeline and connected with the dehydration device through a pipeline. The injection micro-foaming device has the advantages of achieving efficient mixing, eliminating internal stress of injection products and preventing products from being prone to deformation.