The disclosure relates to a load cell for a linear actuator. The load cell configured to measure a force exerted thereon by a rotary motor, and includes a spring element, a hollow portion and at least one strain gauge. The spring element includes a first side and a second side. The first side and the second side are opposite to each other. The hollow portion passes through the spring element. The at least one strain gauge is secured on the spring element and located between the first side and the second side, wherein when the force is exerted on the spring element when the rotary motor is driven to move along the first direction, the second side is moved relative to the first side, the spring element is deformed, and the at least one strain gauge changes shape, so that the force is measured and standardized under a specific range.