The invention provides a simple start diaphragm type carburetor which comprises a carburetor body, a main spray pipe, an air throttle component, a choke valve shaft, linkage components and a starting oil passage, wherein the carburetor body is formed with a main oil supply channel with an air inlet cavity, a throat pipe and a mixing cavity; the main spray pipe is arranged in the position of the throat pipe; the air throttle component is arranged on the carburetor body and controls fuel oil to enter into the mixing cavity, and the choke valve shaft is pivotally connected with the carburetor body; the starting oil passage is formed in the carburetor body, an oil inlet is communicated with a measuring room of the carburetor body, and an oil outlet is communicated with the mixing cavity; and the linkage components comprise a first linkage component, a reset element and a second linkage component in linkage at an interval. When the first linkage component opens the starting oil passage, the second linkage component drives the main oil supply channel to be partially opened, the choke valve shaft is rotated, the choke valve shaft is reset through the reset element, and the starting oil passage is closed. The simple start diaphragm type carburetor can improve the successful starting rate of an engine, maintain the warming-up for a relatively long time and reduce the burden on a user.