The invention relates to a wide opening degree emergency door and cab of pathway vehicle. The emergency door comprises a sealing head cover and a wide opening degree emergency door. A sealing framework is arranged on the car body of the inner around of the sealing head cover. A visible area and an opening mechanism are arranged on the upside of the wide opening degree emergency door. The left and right side of the upside of the wide opening degree emergency door are both fixed with C type hinge component. The wide opening degree emergency door leaf can fold upwards relative to the body frame. Two sides of the wide opening degree emergency door leaf are differently connected to a sealing framework by support components. Concave guiding gutters are provided on the left, right and upper part of the sealing head cover. All around of the edge of the reverse side of the wide opening degree emergency door leaf is provided with the inside and outside of two rings of sealing tape which can be plying-up with the sealing framework and the bottom of the concave guiding gutter. The concave guiding gutters has the advantages of reasonable structure, smooth opening, strong evacuation ability, and also guarantees the density, permeability and vision of the cap.