The invention relates to a method for recovering hydrogen and ammonia from synthetic ammonia purge gas by membrane separation-rectification integrated technology and a production device thereof, and the method comprises treatment in the following three units in order: 1) treatment in a high pressure purge gas membrane separation hydrogen recovery unit; 2) treatment in a low pressure purge gas membrane separation hydrogen recovery unit; 3) treatment in an ammonia water rectification unit. The unit 1) and the unit 2) recover hydrogen and generate ammonia water, and the unit 3) recovers liquid ammonia form the ammonia water, and recycles the rectification kettle liquid as water for ammonia absorption. The invention provides a hydrogen ammonia recovery integrated solution scheme for synthetic ammonia industry; compared with hydrogen ammonia ammonia recovery by traditional simple constant pressure recovery methods, membrane separation methods or ammonia water rectification methods, the method of the invention overcomes the problem of incomplete recovery coverage area and the problem of harmful waste liquid waste gas discharge; during hydrogen ammonia recovery, the discharge of ammonia containing waste water is reduced to zero; and the target of maximization of economic benefits and environmental protection benefits is realized.