The invention discloses a portable large view field high definition bright telescoping zoom lens which is formed by a front group lens, a Pechan prism group and three-component telescope zoom eyepieces, the zoom focal length of the three-component telescope zoom eyepieces of the zoom lens is 7.6-15.6mm, the zoom ratio is 2X, the object space view field is 5.7 degrees -11.8 degrees, the image space is 58.8 degrees, and the optical system working wavelength range of the zoom lens is 0.486-0.656[mu]m; the front group lens, the Pechan prism group, a compensation group, a zooming group and a fixed lens are arranged along the light incidence direction in the optical system of the zoom lens in sequence, and a field diaphragm is arranged between the compensation group and the zooming group; and the front group lens comprises a front bonding group, a half pentaprism, a roof prism, a double-concave lens, a meniscus lens, a double-convex lens and a rear bonding lens. According to the invention, the focal length of the lens can be optionally changed under different distances and different weather conditions, the visual area of the lens is increased by more than 30% compared to the same of the common telescope, the view field is ultra-wide, and the sharpness is good.