The invention provides a computer security login guarantee system. The computer security login guarantee system adopts a central processing device, a password input unit, a password checker, an imagecollection module, an image processing module, an operating system, an alarm device, a wireless transmission device, a user mobile phone, a computer display and a computer memory, a computer owner canauthorize a computer user to use a computer through the mobile phone and can also obtain face image information of the personnel logging in the computer so as to know who is using the computer, and can also know who logs in/attempts to log in the computer at what time through the computer memory, so that the information security of the computer is greatly improved, wherein the image processing module performs image denoising, image enhancement, image sharpening and image smoothing on collected images in turn to collect the image information of the image collection module efficiently and quickly, and the recognition accuracy of the face of the personnel logging in the computer can be improved to effectively reduce the occurrence of misjudgments.