High temperature superconducting motor magnet performance test device

The invention relates to a high temperature superconducting motor magnet performance test device, which comprises magnetic conducting side plates and a magnetic conducting circular arc top plate, wherein the two magnetic conducting side plates form a 'V'-shaped angle and form a magnetic conducting loop with the a magnetic conducting circular arc top plate; the magnetic conducting side plates, the magnetic conducting circular arc top plate and stainless steel end plates on two ends form a vacuum container; vacuum-pumping connectors are arranged on the stainless steel end plates; a heat exchanger is arranged in the vacuum container and is connected with the magnetic conducting circular arc top plate through insulating studs; and the magnetic conducting circular arc top plate is provided with a refrigerant import and export connector communicated with a refrigerant container or a refrigerator. The high temperature superconducting motor magnet performance test device has the advantages that: the problems of larger refrigerant consumption amount, complexity of installation, wiring and other test preparation processes of a magnet, and the like are solved; the cooling method of the magnet is as same as the actual conditions; and the measuring accuracy is improved.