The invention relates to the technical field of measuring equipment for the angles of steering gear input shafts of vehicles, in particular to a measuring device for the rotary angle of a steering gear input shaft. The measuring device comprises a circular shaft sleeve, and the circular shaft sleeve is internally provided with a penetrating hole used for the steering gear input shaft to penetrateinto; a rotary angle scale disc is concentrically arranged outside the circular shaft sleeve, and an annular scale face is arranged on the upper end face of the rotary angle scale disc; the rotary angle scale disc rotatably sleeves the circular shaft sleeve; the rotary angle scale disc is connected with the circular shaft sleeve through a rotary limiting and connecting mechanism; an angle pointercorresponding to the annular scale face is arranged on the outer wall of the circular shaft sleeve. Through the design of the measuring equipment for the rotary angle of the steering gear input shaft,the technical problem in the prior art that the rotary angle of the steering gear input shaft cannot be measured, and then the transmission ratio of the steering gear input shaft cannot be accuratelymeasured is solved.