A vector sensor for curved surface measurement device, comprising: a main body and a vector device connected to the main body ; the vector device comprising a linear extension and an end of the vector device remote from the main body providing a first connector ; a second connector arranged on the main body , at an end opposite to the vector device ; wherein the first connector is provided with a connecting member , and the second connector is provided with a rotating connecting member for connecting with a connecting member of a first connector of another vector device ; and wherein the second connector is located on an extension line (X) of the vector device ; a sensing chip for sensing a vector of gravity to generate a gravity vector sensing value; a processing circuit , connected to the sensing chip , for receiving the sensing result of the sensing chip , and converting the sensing result into spatial position representation data, comprising a coordinate value or a vector value, and to calculate a relative vector value of a vector from the sensing chip to the first connector of the vector device of respective vector sensors , relative to the gravity vector and/or an absolute vector value of a vector from the sensing chip to the first connector of the vector device of respective vector sensors ; a wireless communication circuit , connected to the processing circuit , to transmit the processing result to the outside through a wireless communication channel; and a power supply for providing electrical power to the sensing chip , the processing circuit and/or the wireless communication circuit ; wherein a sensing value signal transmitted by the wireless communication circuit comprises the sensing value and a code representing the vector sensor . a main body and a vector device connected to the main body ; the vector device comprising a linear extension and an end of the vector device remote from the main body providing a first connector ; a second connector arranged on the main body , at an end opposite to the vector device ; wherein the first connector is provided with a connecting member , and the second connector is provided with a rotating connecting member for connecting with a connecting member of a first connector of another vector device ; and wherein the second connector is located on an extension line (X) of the vector device ; a sensing chip for sensing a vector of gravity to generate a gravity vector sensing value; a processing circuit , connected to the sensing chip , for receiving the sensing result of the sensing chip , and converting the sensing result into spatial position representation data, comprising a coordinate value or a vector value, and to calculate a relative vector value of a vector from the sensing chip to the first connector of the vector device of respective vector sensors , relative to the gravity vector and/or an absolute vector value of a vector from the sensing chip to the first connector of the vector device of respective vector sensors ; a wireless communication circuit , connected to the processing circuit , to transmit the processing result to the outside through a wireless communication channel; and a power supply for providing electrical power to the sensing chip , the processing circuit and/or the wireless communication circuit ; wherein a sensing value signal transmitted by the wireless communication circuit comprises the sensing value and a code representing the vector sensor . <EOS>