The invention discloses a project server temperature monitoring and alarming device which comprises a temperature collection circuit, a user key circuit, a single chip microcomputer and peripheral circuit thereof, a digital display circuit, an acoustic alarm circuit, an optical alarm circuit and a voltage stabilizing circuit. The project server temperature monitoring and alarming device has the advantages that the device can monitor operation temperatures of project servers in real time; the device is low in price and simple in material due to combination of the single chip microcomputer and a temperature sensor; the device can be optionally added to completed project servers, so that easy implementation and low cost are realized; when operating environments of the project servers do not meet condition requirements, acoustic and optical alarming can be realized, and operation reliability of the project servers is realized.