The utility model belongs to the technical field of heat preservation air curtain, a an automatic combination heat preservation air curtain device for cold region tunnel is related to. Install in the tunnel face first to special -shaped natural wind air curtain (1), second to special -shaped natural wind air curtain (2), third to dysmorphism hot -blast air curtain (3) automatic control (7) be connected with industrial power supply (5) are installed to the inner wall of tunnel (4) be equipped with first switch (8) in automatic control (7), second way switch (9) and third way switch (10) and single chip microcomputer control portion (6) install on the outside wall in tunnel face air velocity transducer (11) and temperature sensor (12), and with single chip microcomputer control portion (6) electricity is connected. The beneficial effects of the utility model are that: simple structure, reasonable in design, convenient to use, automatic control, energy -concerving and environment -protective, winter protection keep warm effectual, low in cost, construction convenience and do not influence characteristics such as driving safety.