The present utility model relates to a device for realizing qualified detection of an automobile engine cylinder body, especially to a device for detecting automobile engine cylinder body end face pin hole position. The device comprises a roller plate (3) which is fixed on a support plate (1) and used for bearing an engine cylinder body (2), a tensioning mechanism (5) which is controlled by a control handle (4) and used for tensioning and positioning crankshaft holes of the mobile engine cylinder body (2), an inserting rod (7) and a scanning gauge (8) which are fixed on a support (6) and used for measuring front and rear end face pin hole positions of the tensioned and positioned engine cylinder body (2). A vertical adjusting mechanism is arranged below a supporting plate (9), and a horizontal adjusting mechanism is arranged below a guide pillar II (29). The device is simple in structure and has a low requirement on working personnel.