The invention relates to the technical field of vehicle-mounted refrigerators, in particular to a portable vehicle-mounted refrigerator with double refrigerating systems and a control method of the portable vehicle-mounted refrigerator. The refrigerator comprises a main body, a storage chamber is arranged in the main body, a door body is rotationally installed at the top of the main body, a pluggable battery is installed in the main body, a compressor
assembly and a
semiconductor refrigeration assembly are arranged in the main body and used for refrigerating the storage chamber, and a control panel is arranged in the main body; the air conditioner has three working states, switching of multiple states is achieved in combination with
refrigeration requirements, after an external power source is connected, full-power
refrigeration can be started by pressing a freezing switch key for a short time, the two different refrigeration assemblies are started at the same time, and rapid cooling is achieved; when the refrigeration switch key is pressed for a short time, only the
semiconductor is used for refrigeration and gentle cooling; under the condition that an external power supply is not connected, a freezing switch key is pressed down, only the compressor is adopted for refrigeration and rapid cooling, and the rapid freezing requirement of a user is met; and under the condition that an external power supply is not connected, batteries are adopted for power supply, and the equipment flexibility is good.