The invention discloses a method for measuring the meshing depth of contacts of a handcart type circuit breaker of a closed armored high-voltage switch cabinet. Counting is started when a moving contact enters the fixed contact after the handcart type circuit breaker is pushed into the switch cabinet, namely that the counting is started when the fixed contact is ejected by an ejector rod of a displacement sensor until a handcart moves to the working position and accordingly a section of displacement stroke can be produced, the displacement stroke is detected and output through a sensor and read and processed through a data processing module, and displacement stroke data are directly displayed in a man-machine interface display module; workers determine whether the requirements of the meshing depth of the moving contact and the fixed contact of the handcart type circuit breaker of the high-voltage switch cabinet are met or not and the handcart can move away, a measurement device can be detached, and the working position of the handcart can be reset if yes; the workers are required to move away the handcart, increase or decrease the number of installing gaskets of the fixed contact according to needs and repeat the above work until the requirements are met if not. The method for measuring the meshing depth of the contacts of the handcart type circuit breaker of the closed armored high-voltage switch cabinet is convenient and accurate.