Conventionally, the influence of guy wire and wind load on derrick was often ignored in the static strength analysis on derrick of truck-mounted workover rig, but it does not accord with the actual working conditions. This paper made the finite element analysis on a derrick of truck-mounted workover rig through ABAQUS software. Under different static hock loads and wind loads, the maximum static hock load the derrick can bear was obtained and the weak point position on derrick was determined. Based on the calculation, the cable-stayed range of guy wire was reasonably shortened.