The subject innovation is when pressed by the weight of the locking member provided in the body frame is specifically wheel than relates to a coupling structure of the upper frame for fixing the body frame and the engine and the pump of small multi-purpose water spray installed engine locking member is rotated while carefully engine is automatically a locking to occur by, and furthermore the termination of the body frame and the engine and the coupling of the upper frame, the pump is provided when receiving Lee Dongjung movement is limited by the narrow ramp into the fire for the fire extinguishing a more free movement by facilitating access to the fire box and a small multi-purpose water spray of the driving engine of the engagement structure of the upper frame that is fixed to the body frame and the engine and the pump with a small multi-purpose water spray so as to ensure safety and to prevent the overturn inbound will present the pump is designed as a pump connection Engaging rod and formed on the bottom portion of the upper frame to prevent the engine flows; To movably rotated by the hinge has a body frame provided with wheels on the bottom surface with a locking member which is hung on the engaging rod; The one end fixed to the body frame and the other end is characterized in that comprising an spring member connected to rokjing member.