Online monitoring and diagnosis device and method for intelligent pre-filter

The invention provides an online monitoring and diagnosis device and method for an intelligent pre-filter. The device comprises an intelligent sample distribution system and an intelligent diagnosis unit, wherein the intelligent sample distribution system and the intelligent diagnosis unit are sequentially connected to the pre-filter, and additionally, the intelligent diagnosis unit is sequentially connected with a pre-filter operation PLC (programmable logic controller) upper computer and a pre-filtration operation PLC through a communication interface; the intelligent sample distribution system comprises a sample cooling device, a sample distribution device and an online laser particle counter; the intelligent diagnosis unit comprises a switch, a diagnosis assessment module and a communication interface module; the intelligent sample distribution system monitors the quantity, the size, and particle size distribution indexes of suspended particles in multiple paths of water samples and transmits data to the intelligent diagnosis unit, and the intelligent diagnosis unit acquires operation data of the pre-filter from a program control system. Single and comprehensive analysis assessment indexes are adopted, the operation conditions of the pre-filter and a unit are comprehensively diagnosed and assessed, real-time and intelligent instructions are provided for operation of the pre-filter, and the operation level is improved.