The invention provides a hard-disk module which comprises a hard-disk support, a hard disk, a hard-disk backboard and a temperature detection circuit. The hard disk is installed on the hard-disk support, the hard-disk backboard is electrically connected with the hard disk, and the temperature detection circuit is arranged on the hard-disk support. The temperature detection circuit is used for detecting the temperature of one side, away from the hard-disk backboard, of the hard disk and comprises a temperature detection chip and a lead, wherein the temperature detection chip is installed on the hard-disk support and is connected with the hard-disk backboard through the lead. The temperature of one side away from the hard-disk backboard can be detected in real time through the hard-disk module, and accurate reference can be provided for fan control.