The invention discloses a circuit board circuit testing-used fixing device, which comprises a shell. The bottom of the shell is symmetrically fixedly connected with supporting legs; the left side of the top of the shell is fixedly connected with a first fixing block; and the top of the first fixing block is fixedly connected with a first clamping block. Through matched use among the first fixing block, the first clamping block, a second fixing block, a sliding rod, a sliding sleeve, a connecting block, a second clamping block, a first opening, a fixing plate, a sliding groove, a second opening, a forward / reversal rotation motor, a first gear, a second gear, a rotating rod, a cylinder, a spiral groove, a connecting rod, a slider and a sliding rod, the problem that when the existing circuitboard fixing device fixes the circuit board, manual operation of a user is required can be solved. The circuit board circuit testing-used fixing device has the advantage of automatic clamping. The labor intensity of a user is reduced, the use by the user is facilitated, and the practicability of the circuit board fixing device is improved.