The utility model relates to the technical field of pump houses, and discloses an outdoor pump house convenient to assemble, which comprises a main body mechanism, a power generation mechanism and an auxiliary mechanism, the power generation mechanism is positioned at the upper end of the main body mechanism, the auxiliary mechanism is positioned at the lower end of the main body mechanism, and the main body mechanism comprises a pump house bottom plate, a fixing groove and a bearing column. According to the outdoor pump room convenient to assemble, through installation of the main body mechanism, in the installation process of the pump room, the pump room can be disassembled into parts so that the parts can be conveniently transported and assembled after arriving at the site, firstly, the four bearing columns are inserted into the fixing grooves in the bottom plate of the pump room to be fixed, then the pump room wall plates are installed in the clamping grooves in the bearing columns, and then the pump room wall plates are assembled. According to the convenient-to-assemble outdoor pump house, the pump house wall plates are fixed through connection of the fixing holes and the fixing bolts, and finally the pump house top plate is installed at the upper ends of the pump house wall plates, so that the pump house is assembled, the structure is simple, assembling is convenient, the working efficiency can be effectively improved, and the practicability of the convenient-to-assemble outdoor pump house is improved.