A manufacturing method and a manufacturing equipment of an electrode assembly, a battery cell, a battery, and an electrical device. The manufacturing method of the electrode assembly specifically includes: providing roll materials including: a cathode plate roll, a separator roll, and an anode plate roll, in which, the separator roll includes a separator body and an early warning coating arranged on the separator body; the separator body has a head end and a tail end at two opposite ends along a winding direction thereof; and the early warning coating is configured to be spaced from the tail end by a first preset length; stacking and winding a cathode plate of the cathode plate roll, the separator body of the separator roll, and an anode plate of the anode plate roll; and detecting, in the winding process, whether the early warning coating is arranged on the separator body.