The invention discloses a band type parking brake cylinder of a vehicle. The band type parking brake cylinder comprises a unit brake cylinder and a parking cylinder, wherein the unit brake cylinder comprises a brake cylinder body, a middle body, a brake piston assembly, a brake modulating mechanism and a yoke, wherein the brake modulating mechanism comprises a regulating shaft, a guide nut assembly, a resistance regulating assembly and a regulating nut assembly; the resistance regulating assembly comprises a resistance regulating guide base, a resistance regulating gasket and a resistance regulating spring; the parking brake cylinder comprises a parking cylinder body, a parking piston assembly and a parking control mechanism; the parking piston assembly comprises a parking piston, a parking energy storage spring, a parking screw, a parking thread sleeve, a lower spring base and a ratchet wheel; and the parking control mechanism comprises a wedge-shaped body and a thrust sleeve. The band type parking brake cylinder is reliable in brake performance, can avoid the occurrence of a phenomenon that a gap between a brake pad and a brake disc is reduced due to the fact that a lever is elastically deformed to trigger the brake modulating mechanism to generate gap regulation; and moreover, parking brake force is relatively great, so that number of parking cylinders used in the whole vehicle is reduced.