The invention discloses a suction type membrane filtration suspended particle trap for marine environmental monitoring, and aims to provide a collection device which is convenient to operate, low in labor intensity and high in automatic degree and is particularly applicable to the process of sampling massive monitoring points respectively in different areas. The trap comprises a rack, a water pump, a traction rope, a balancing weight, a water pumping pipeline, a first diversion pipe, a second diversion pipe, a rotating shaft and two mounting casings, wherein the first diversion pipe and the second diversion pipe are fixedly arranged on the rack; the rotating shaft is arranged on the rack in a rotating manner; the two mounting casings are uniformly distributed along the circumference of the rotating shaft; a particle sampling device is arranged in one mounting casing, and a washing diversion device is arranged in the other mounting casing; one end of the water pumping pipeline is connected with the water inlet of the water pump; and one end of the first diversion pipe is connected with the water outlet of the water pump.