Ballast track sensor installation construction protection device and construction method

The invention provides a ballast track sensor installation construction protection device and a construction method, and belongs to the field of ballast bed construction. The ballast track sensor installation construction protection device comprises a main protection unit and an auxiliary protection unit. A foundation bed operation opening is formed in the bottom of a main operation cavity of themain protection unit, the top of the main operation cavity is open to form a main butt joint opening, and the main protection unit is further provided with a main connecting structure. An inlet is formed in the top of an auxiliary operation cavity of the auxiliary protection unit, the bottom of the auxiliary operation cavity is open to form an auxiliary butt joint opening, the auxiliary butt jointopening is used for being in butt joint communication with the main butt joint opening, the auxiliary protection unit is further provided with an auxiliary connecting structure, and the main protection unit and the auxiliary