The invention discloses a truck cab roof crushing simulation analysis method. The method comprises the following steps that 1, establishing a truck cab finite element model; 2, constructing a cab roofcrushing simulation model; 3, establishing a contact relationship and defining contact; 4, performing collision simulation analysis to obtain a cab top bearing capacity value result; 5, according tothe bearing capacity and displacement curve and the speed and time curve of the structure, if the movement speed is larger than zero and deformation of the cab structure is still continuously increased, showing that the cab structure is not stable but still at the moment; and 6, according to the structural bearing capacity and displacement curve and the speed and time curve, if the movement speedtends to zero and the structural deformation of the cab is not increased any more, regarding the peak value as the actual bearing capacity of the top of the cab. According to the invention, the simulation result can better accord with the actual situation.