The present disclosure relates to a method for judging invalid work diagram based on
point data, comprising: calling work diagram data, splitting into upstroke and downstroke displacement load
data set, determining whether there is load stagger, if there is, judging as invalid work diagram and ending the judgment process, otherwise, continuing to calculate whether there is displacement reversal, if there is, judging as invalid work diagram and ending the judgment process, otherwise, continuing to combine with
static data of pumping unit well, determining whether there is load anomaly, if there is, judging as invalid work diagram and ending the judgment process, otherwise, continuing to calculate whether there is
stroke anomaly, if there is, judging as invalid work diagram, otherwise, as qualified work diagram, ending the judgment process; the present disclosure analyzes abnormal data characteristics of work diagram shape, load,
stroke and
stroke frequency, calculates abnormal characteristics by using work diagram coordinate
data vector, so as to realize automatic identification, diagnosis and push of various abnormal invalid work diagrams, thereby replacing manual analysis and judgment of invalid work diagram work and improving work efficiency.