The invention discloses a block particle filter monitoring machine room alarm system, comprising a video collecting module for capturing on-site scene. The video collecting module comprises a camera, a video encoder, and a front end monitor for finishing the control work of image collecting, and coding and a video camera; a video analyzing module, which is a kernel module of the whole method to analyze a real-time video image, extract the foreground and lock abnormal alarm information of a server, wherein the video analyzing module is used for inputting real-time image data, analyzing the video and outputting alarm information of the server; an alarming module which is used for using GSM GPRS Modem to transmit a short-message to inform a server manager for the first time after the server receives the alarm information transmitted by the video, and a video terminal automatically transmits warning beep while there is moving object. The alarm system of the invention could timely and accurately respond the moving object in the server or the warning beep generated by the server in a machine room so as to achieve the normalization and high efficiency of operation and maintenance management of the server in the machine room.