The invention discloses an electricity consumption information collection terminal daily timing error testing method and an electricity consumption information collection terminal daily timing error testing system. The electricity consumption information collection terminal daily timing error testing method comprises that a testing master station transmits heartbeat frames to a terminal and records the master station transmitting times; the testing master station receives the confirmation frames transmitted by the terminal, and records the master station receiving times at the terminal receiving times and the terminal transmitting times, a new round of heartbeat frames are immediately transmitted, and a new round of the master station transmitting times are simultaneously recorded; when the number of the heartbeat frames transmitted by the testing master station exceeds a preset transmitting value, the starting time error between the terminal and the testing master station is calculated; the current time of the testing master station is recorded as the master station starting time, and the terminal continuously runs for N h; the testing master station repeatedly transmits heartbeatframes to the terminal, and when the number of the heartbeat frames transmitted by the testing master station exceeds the preset transmitting value again, the ending time error between the terminal and the testing master station is calculated, and the current time of the master station is recorded as the master station ending time; and according to the content, the electricity consumption information collection terminal daily timing error is calculated.