Self-checking method of vehicle-mounted charger, vehicle-mounted controller and readable storage medium

The invention discloses a self-checking method of a vehicle-mounted charger, a vehicle-mounted controller and a readable storage medium, and the self-checking method comprises the following steps: carrying out a discharge self-checking step in a discharge self-checking mode: S101, controlling a PFC module and a bidirectional DC/DC module to start in a vehicle starting state so as to invert a direct current provided by a battery module into an alternating current, and entering the discharge self-checking mode; s102, sampling the alternating current to obtain first sampling information; s103, judging whether first information comprising the first sampling information is in a first preset threshold range group, if not, determining that the discharge self-inspection result is a primary fault, and if yes, skipping to S104; s104, in a discharge self-check mode, controlling a load to be connected in parallel to the output side of the PFC module, and sampling the alternating current to obtain second sampling informat