The invention discloses a rear tilt angle pumping unit, which includes a base, a vertical column, a boom, power wheels, a driving mechanism, a swing arm, a support frame, a weight box, a
rope roll, arope stabilizer, a beam hanger and a
steel rope. The lower end of the vertical column is fixed to the base, the upper end of the vertical column is fixedly connected with the boom, and the two ends ofthe swing arm are connected with the vertical column and the weight box correspondingly; the support frame and the driving mechanism are both fixed to the base, and the power wheels are fixed to thetwo sides of the support frame; the power wheels are eccentrically connected with a connecting rod for being movably connected with the swing arm, and the
rope stabilizer is fixed to the vertical column; and the
rope roll includes a first rope roll, a second rope roll, a third rope roll, a fourth rope roll, a fifth rope roll, a sixth rope roll and a seventh rope roll, one end of the
steel rope isconnected with the beam hanger, and the other end of the
steel rope is connected to the rope stabilizer after successively bypassing the first rope roll, the second rope roll, the third rope roll, thefourth rope roll, the fifth rope roll, the sixth rope roll and the seventh rope roll. The rear tilt angle pumping unit can realize smooth reversing in the whole oil pumping process, and meanwhile, long-
stroke oil pumping can be easily realized.