The invention provides a mechanically-controllable cracking device with a high attenuation coefficient and relates to a mechanically-controllable cracking device. The mechanically-controllable cracking device is provided with a skeleton base, a stepping motor, a micro chip and a probe device; the skeleton base is a stainless steel cylindrical base; an opening is formed in the stepping motor, and the micro chip, the probe device and the stepping motor are assembled and fixed on the opening for single molecular test; the stepping motor is connected with the skeleton base; the micro chip is provided with a polyimide layer and a gold electrode; a micro electrode in the micro chip is led out by the probe device to form a planar external electrode, the probe device is provided with a supporting structure and a contact structure, the supporting structure can adopt a bridge type structure made of an aluminum alloy material, and a hole with a diameter of 1 cm is drilled in the center of the supporting structure for the erection of the micro chip; the contact structure takes the hole in the middle of the supporting structure as a dividing line, and polyester-coated flexible copper-clad laminates, polyfluortetraethylene plates, epoxy fiberglass cloth substrates and silver needles are symmetrically assembled on the two sides.