The invention relates to the technical field of splashing preventing devices, and provides a splashing preventing device for an oil-water well in trial production. The device comprises an outer barrel body and an inner barrel body, wherein the inner barrel body is positioned in a right chamber body of the outer barrel body; a first-stage baffle board is fixedly connected to the inner side of the left end of the inner barrel body; a bottom plate is fixedly connected to the inner side of the right end of the inner barrel body; a sealing chamber is formed among the inner barrel body, the first-stage baffle board and the bottom plate; a left annular baffle and a right annular baffle are correspondingly fixedly connected between the left end and the right end of the inner barrel body and the outer barrel body. The device is reasonable and compact in structure, and convenient to use; the outer barrel body, the inner barrel body, the first-stage baffle board and a second-stage baffle board are used in match to achieve the purposes of splashing preventing, environment protecting, and clean construction. The device has the characteristics of being safe, reliable, convenient to observe, free of manual cleaning, and good in splashing preventing effect; the secondary pollution of oil gas water to a well site and equipment can be reduced; the operation is convenient; the working efficiency is improved; the labor intensity of an operator can be greatly reduced.