Parallel-connection oil level controlled testing device for measuring refrigeration compressor oil circulating rate in online mode

The invention belongs to the field of refrigeration techniques and particularly relates to a parallel-connection oil level controlled testing device for measuring the refrigeration compressor oil circulating rate in an online mode. The testing device comprises an oil separator arranged at an exhaust end of a compressor, wherein an oil outlet end and a refrigerating fluid outlet end are arranged on the oil separator, the refrigerating fluid outlet end is communicated with an air suction port end of the compressor at least through a condenser, a liquid storage device and an evaporator to form a refrigerant circuit, and the oil outlet end is communicate with an air suction oil return port end of the compressor to form an oil circulation circuit. The testing device further comprises a containing portion, wherein the bottom of the cavity of the containing cavity is communicated with the bottom of the cavity of the oil separator to form a communication device structure, a communication portion is formed between the