Coextruded film abnormal crystal point detection clamp and coextruded film crystal point detection method

The invention provides a clamp for detecting abnormal crystal points of a co-extruded film. The clamp comprises a first mold and a second mold, each of the first mold and the second mold is provided with a mold closing plane, a slicing plane located on the upper side and a placing plane located on the lower side, the mold closing planes are perpendicular to the slicing planes and the placing planes, and the mold closing planes are provided with grooves penetrating through the upper surfaces and the lower surfaces of the molds; when the first mold and the second mold are closed, the planes of the two slices are coplanar, the first mold and the second mold are closed, so that a film to be detected is clamped between the mold closing planes of the first mold and the second mold, and the two grooves are opposite to form an observation channel for observing an area to be detected; the invention further provides a co-extruded film crystal point detection method applying the co-extruded film abnormal crystal point d