The invention provides a to-be-detected element locating device for a detecting platform and relates to an element locating device. The to-be-detected element locating device is provided with a rotating platform, a rotating base, a shift mechanism, a rough adjustment mechanism, a rectangular
magnet, an angle displayer, a fine adjustment mechanism, a fixing block, a non-
contact type sensor and a PC. The shift mechanism is provided with a
crankshaft, a
crankshaft fixing base, an upper shift limiting block, a lower shift limiting block and a
handle. The rough adjustment mechanism is provided with a rough adjustment screw rod nut, a rough adjustment screw rod, a rough adjustment screw rod nut base, a rough adjustment rack, a rough adjustment knob and a rough adjustment limiting block. The structure of the fine adjustment mechanism is the same as that of the rough adjustment mechanism. The screw
pitch between a fine adjustment screw rod nut and a fine adjustment screw rod is far smaller than the screw
pitch between the rough adjustment screw rod nut and the rough adjustment screw rod. The adjustment range of the rough adjustment mechanism is from -5 degrees to 5 degrees, and the adjustment range of the fine adjustment mechanism is from -1 degree to 1 degree. The placing angle of work-pieces can be accurately adjusted, installation is simple, operation is simple, fine adjustment and rough adjustment can be carried out, the locating accuracy can be ensured, the detection precision of the detecting platform is not influenced, and the locating device can be used together with most detecting platforms.