The invention discloses remote fault diagnosis method and system for an alcohol tester based on a GPRS. A CPU module in the alcohol tester is connected with an SIM card through a GPRS module which is connected with an antenna. The remote fault diagnosis method comprises the steps of: checking working states of all modules in the tester through a fault self-checking program of the tester; transmitting the check result of the fault self-checking program to a monitoring center of a tester manufacturer through the GPRS module; and knowing the working state of the tester according to the check result for fault recovery. The monitoring center has a favorable human-machine interface, can directly reflect the working state information of relevant equipment of the tester, better monitor the remotealcohol tester, carry out the statistical analysis on the received state information of the equipment of the tester, and be applied to the following service plan system. The tester also has the GPS positioning function, positions the tester of a service point through a positioning satellite and provides telephone or visiting service for the fault which can not be remotely recovered.