The invention relates to an automatic machined part measuring system and an automatic scoring method. The measuring system comprises a non-contact measuring mechanism and a testing service station, the testing service station is connected with the non-contact measuring mechanism, a numerical control machine tool, a school teaching management system and a mobile phone of a trained student through anetwork and comprises laser, a visual signal processing unit, a numerical control machine tool data acquisition unit, an automatic machined part scoring unit, a school teaching management system interaction unit and a mobile terminal interaction unit, the scoring unit acquires total training score A, A=k1*A1+k2*A2+k3*A3+k4*A4, k1, k2, k3 and k4 are score weighting coefficients which are set according to practical situations by mentors, default values are given by the system, A1 refers to machining dimension precision score, A2 refers to machining technology quality score, A3 refers to machining efficiency score, and A4 refers to attendance discipline score.