The invention discloses halogen-free flame retardant foamed EVM (ethylene vinyl acetate copolymer) rubber and a manufacturing method thereof. The rubber is prepared from the following raw materials inparts by weight: 100 parts of EVM 500PXL, 10-20 parts of carbon black N774, 5-7 parts of a plasticizer DOS, 5-7 parts of a plasticizer TOTM, 1-2 parts of zinc stearate, 1-2 parts of a dispersing agent, 1-2 parts of polyethylene wax, 4-6 parts of a foaming agent HH138, 2-3 parts of a cross-linking agent BIBP, 1-2 parts of a cross-linking agent TAIC, 3 parts of an antihydrolysis agent P50, 1-2 parts of preservation wax, 1-2 parts of an anti-aging agent 445, 1-2 parts of an anti-aging agent TMQ and 80-120 parts of flame-retardant fillers. The manufacturing method comprises the following steps: kneading and milling the raw materials, so as to obtain a rubber compound material; feeding the rubber compound material into a pin cold feed extruder, so as to extrude a higher-density preformed film;slicing the preformed film on a conveying belt at a fixed length, so as to obtain a film with the fixed length; performing primary sulfurization foaming on the film with the fixed length with a primary square mould and secondary sulfurization foaming on the film with the fixed length with a secondary square mould; naturally cooling for 10-15 days under a normal temperature, so as to obtain the halogen-free flame retardant foamed EVM rubber. The EVM rubber is strong in toughness, good in heat preservation and good in elasticity and is high-low temperature-resistant, anti-aging, oil-resistant,halogen-free, flame-retardant, environmentally friendly and non-toxic.