Transmit-receive assembly test system and terahertz front-end transmit-receive assembly test platform

The invention discloses a transmitting-receiving assembly test system and a terahertz front-end transmitting-receiving assembly test platform. The system comprises a first antenna, a single-pole double-throw switch group, a single-pole multi-throw switch and a signal processing unit. Wherein the first antenna is connected with a to-be-tested transmit-receive assembly; the head end of the single-pole double-throw switch group is connected with a first antenna through a first cable, the tail end of the single-pole double-throw switch group is connected with a load, and the single-pole double-throw switch group comprises a plurality of single-pole double-throw switches which are sequentially connected in series through a second cable; each input end of the single-pole multi-throw switch is connected with one output end of each single-pole double-throw switch. According to the invention, the cable transmission distance of the electromagnetic wave signal during the test can be controlled by controlling the series