The invention discloses a multipurpose three-phase test device, and belongs to the field of measuring devices. The multipurpose three-phase test device is provided with a test bar. A left-phase contact probe, a middle-phase contact probe and a right-phase contact probe are arranged at the front end of the test bar and are respectively correspondingly connected with three signal input ends of a three-phase tester by wires; two telescopic sleeves are respectively arranged at two edges of a transverse rod at the front end of the test bar; the left-phase contact probe and the right-phase contact probe are respectively fixed onto the telescopic sleeves; the middle-phase contact probe is fixed onto a middle fixing portion of the transverse rod; the left-phase contact probe and the right-phase contact probe are fixed onto the transverse rod at the front end of the test bar, and the middle-phase contact probe is fixed onto the transverse rod at the front end of the test bar by the aid of a spring; the three-phase tester is fixed onto a handheld rod of the test bar. The multipurpose three-phase test device has the advantages that contact frequencies of operators and live equipment can be reduced owing to a three-phase test point simultaneous contact measurement mode, accordingly, work risks can be reduced for test persons, inter-phase short-circuit accidents can be prevented, and the multipurpose three-phase test device is beneficial to increasing the speeds of integral test work; the multipurpose three-phase test device can be widely used in the fields of three-phase electric signal tests for low-voltage power supply systems.